Learn How Money and Central Banks Work – How Loans Create Money, Inflation vs Deflation, Interest Rates, the Money Supply Cycle and How It All Connects

Introduction:

You want to know about the roles of central banks in countries. This is a broad but fundamental question in economics and finance. Central banks have core mandates like monetary policy, financial stability, and currency issuance, but they also have evolving roles like supporting economic growth and modern challenges like climate change. The central bank is the guardian of a nation's monetary and financial stability, acting as the ultimate authority to ensure the system functions smoothly, fosters confidence, and supports sustainable economic growth. The degree of political independence is crucial. An independent central bank like the ECB is generally seen as more credible in fighting inflation. The ECB's primary goal is price stability. While Fed has a dual mandate like price stability and max employment. Others may have additional goals like supporting the government's economic policy. In some countries like the UK, the ECB the central bank is also the main financial regulator. In others like germany, USA regulatory functions are shared with separate agencies. Central banks are the cornerstone of a country's financial and economic system. While their specific mandates can vary, their core roles are remarkably consistent across the globe.

Roles of a central bank:

It maintain price stability i.e. control inflation. This is almost universally their most important task. They do this by setting the benchmark interest rate like Fed Funds Rate to control borrowing costs, spending, and investment. They buy and sell government securities to adjust the money supply. It mandates the amount of funds commercial banks must hold in reserve. It also see large scale asset purchases or sales to provide or drain liquidity in extraordinary times. It has the exclusive right to issue banknotes and coins. They ensures the public's trust in the nation's currency by fighting counterfeiting and managing the quality of notes in circulation.

They handles the government's primary bank accounts. It manages the processing of government receipts and payments like tax collections, pension payments. It often acts as the agent for issuing and servicing government debt like treasury bonds/bills, though the debt management policy is typically set by the Ministry of Finance.

It acts as banker to commercial banks & lender of last resort. It holds the reserve deposits of commercial banks.

It operates or oversees the core payment and settlement systems that allow interbank transfers, ensuring the smooth functioning of the entire financial system. It provides emergency liquidity to solvent but illiquid financial institutions during a crisis to prevent bank runs and systemic collapse. It sets and enforces rules to ensure the safety and soundness of banks and other key financial institutions.

It monitors the entire financial system to identify and mitigate broad risks that could trigger a crisis. This includes monitoring asset bubbles like in housing and excessive credit growth.

It manages the country's official foreign currency and gold reserves to support the exchange rate policy, ensure the country can meet its international payment obligations, and provide a buffer against external shocks.

It implements the government's chosen exchange rate policy, whether it's a free float, managed float, peg, or currency board arrangement. It may buy or sell foreign currency in the market to influence the exchange rate.

It promotes economic growth and employment. While price stability is the primary goal, many central banks like the U.S. federal reserve have a dual mandate to also foster maximum sustainable employment. Monetary policy is calibrated to support a healthy economy without overheating it.

In many developing countries, central banks actively work to broaden access to formal financial services like banking, credit, insurance for the population and to develop capital markets.

Central banks are major hubs of economic research. They collect and analyze vast amounts of data to inform their policy decisions, publish economic forecasts, and contribute to public understanding of the economy.

Many central banks are now researching and developing Central Bank Digital Currencies (CBDCs). Central banks are analyzing climate related financial risks both physical and transition risks to the stability of the banking sector and the broader economy. It protects the integrity of the financial infrastructure from cyber threats is a top priority.

How a bank loan creates new digital money out of thin air?

You go to Bank A and ask for a $10,000 car loan. The bank checks your credit and approves. The bank does not go to a vault, take $10,000 from someone else's pile, and give it to you. Instead, it does two simple accounting entries:

1. On the liability side of its balance sheet. It creates a new bank deposit account for you with a balance of +$10,000. This is now your asset. Liabilities is what the bank owes. A customer deposit is a liability to the bank because it owes you that money on demand.
2. On the asset side of its balance sheet: It creates a new loan asset worth $10,000. Assets is what the bank owns. It adds your loan $10,000 as its assets. This is an IOU from you, something the bank owns and your promise to pay.

What just happened?

The bank created $10,000 in brand new digital money (your deposit) balanced by your $10,000 IOU (the loan). This new deposit didn't exist before. It wasn't transferred from anyone else. It was created at the moment the loan was approved. This is called credit creation. Banks are legally allowed to do this within limits.

Your bank account now shows $10,000. The total money supply in the economy just increased by $10,000.

You go to the car dealer and pay $10,000 via digital transfer from your account. The dealer's bank (Bank B) now has a new $10,000 deposit. The digital money has moved, but still exists.

Let's say you want $500 of that loan in physical cash to pay for something in person. You go to an ATM and request $500. Your bank (Bank A) reduces your digital balance by $500. It gives you $500 in physical bills from its cash reserves. The bank's total assets haven't changed, it swapped $500 of digital reserves for $500 less in physical cash in its ATM. Your $500 in cash was already part of the money supply. No new money was created by printing cash.

What happens if we don't pay back the loan?

The new money created by your loan doesn't just disappear, it becomes a ghost in the system that the bank must deal with and it can cause real damage.

Imagine you default on your $10,000 loan. You stop making payments. The bank's $10,000 loan asset is now worth less, it's a non-performing loan.

The bank tries to recover. The bank will send collectors. Seize collateral if there was any like your car and house. Sell that collateral for whatever it can get. Imagine they sell it for $6,000 for a car you bought with the $10,000 loan.

The bank now must account for the loss. Let's say it sold your car for $6,000 but you owed $10,000.

On the bank's balance sheet, the Loan asset $10,000 is wiped out and set to $0. It gains $6,000 in cash from the sale of your car. It records a loss of $4,000.

Who bears that $4,000 loss? The bank's shareholders do. It comes out of the bank's capital, its own equity, which is the cushion that protects depositors.

What happens to the digital money?

This is the key:

• The $10,000 in digital money the bank created when it gave you the loan is still out there in the economy. It's in the car dealer's account, or whoever you paid.
• That money does NOT vanish automatically. The bank destroyed the asset (your loan), but not the corresponding liability (the digital money it created).
• The money supply remains inflated by $10,000, but the bank's balance sheet is now wounded.

The digital money created by your loan represents a social promise, the bank's promise that your deposit is valid. When you default, you break your promise to the bank, but the bank still must keep its promise to depositors, unless it fails.

How will inflation situation occurs?

Inflation means too much money chasing too few goods. 

There are 4 different types of inflation.

• Demand pull inflation (too much money chasing goods):

How it happens:

Because of very low unemployment and rising wages, a booming stock or housing market or the government sending out stimulus checks makes people feel rich and confident

With more money in their pockets, people go out and buy more cars, gadgets, restaurant meals and houses.

Factories, farms, and shops initially have enough supply. But as demand keeps soaring, they hit limits. They can't magically produce more overnight. They run out of inventory, and delivery times get longer.

Seeing their shelves empty and order books full, businesses realize they can raise prices. And they do. Why sell a car for $30,000 when 10 people are willing to pay $33,000.

Workers see prices rising, so they demand higher wages to keep up. Employers, now paying higher wages, raise prices further to protect their profits. This creates a self-reinforcing loop.

e.g. It's like a popular concert. There are 1,000 seats i.e. goods, but 5,000 fans show up with cash i.e. money. Scalpers i.e. the market immediately resell tickets for 5x the price.

• Cost push inflation (supplies get more expensive):

This is not about too much demand, but about a shock to supply that makes producing things costlier.

How it happens:

A sudden supply shock hits a commodity.

Geopolitical: A war disrupts oil/gas exports. Energy prices triple.

Weather: A drought destroys wheat crops. Grain prices skyrocket.

Logistics: A global pandemic clogs ports. Shipping costs 10x.

This sudden supply shock rises costs for everyone. Oil is needed for transport, plastic, fertilizer. Wheat is needed for bread, pasta, animal feed. Higher shipping costs affect everything from electronics to furniture.

Businesses bear those costs. The company making your bread now pays more for flour, fuel for delivery trucks, and plastic for packaging. To survive, it must raise the price of a loaf of bread.

Prices are rising, but people aren't richer. In fact, their purchasing power falls. The economy can slow down i.e. stagnate while prices inflate. This is a central bank's nightmare.

e.g. It's like a lemonade stand. A frost kills half the lemons. The cost of making lemonade doubles. You have to charge $4 instead of $2 per cup, even though customers don't have more money. You sell less lemonade i.e. stagnation at a higher price i.e. inflation.

• Built in or expectational inflation (the self fulfilling prophecy):

This is the psychological engine that keeps inflation alive.

How it happens:

• People and businesses expect prices to rise 5% next year.

• Workers demand 5%+ raises to get ahead of it.

• Businesses, expecting both higher costs and that competitors will raise prices, pre-emptively raise their own prices by 5%+.

• Because everyone acted on the expectation, it comes true. This expectation becomes baked in to all economic decisions, making inflation persistent and hard to kill.

• Monetary inflation (printing money):

This is what most people think of, but it's more specific.

How it happens:

• The central bank creates an extreme amount of new money digitally, far beyond the economy's growth, usually to finance government spending during a crisis like wartime or a pandemic.

• This massive influx of money hits the financial system. If it's not matched by a rise in goods and services, the value of each dollar falls.

• This turns into the demand pull inflation described above if all that new money ends up in people's hands and they spend it. If it just sits in bank accounts or inflates stock prices, consumer inflation might be delayed.

e.g. If everyone playing Monopoly gets handed an extra $5000 at the start, the first player to land on Boardwalk will be charged $1000 instead of $50. The money supply grew, but the property did not.

A typical modern inflation like post 2021 is often a deadly combination:

Phase 1 occurs with cost push inflation. A supply shock hits because of COVID disruptions, then Ukraine war. During this period energy & food prices spike.

Phase 2 occurs with demand pull inflation. Coming out of the pandemic, people have gathered savings and want to spend. Governments provided stimulus. Demand surges just as supply is crippled.

Phase 3 was expectational inflation. People see prices rising everywhere for months. They start expecting it to continue, demanding higher wages, which businesses then use to justify further price hikes.

The central bank's brutal job is to break this cycle, usually by using high interest rates to crush demand of demand pull inflation and shatter expectations of expectations inflation, even though it can't do anything about the initial supply shock of cost pull inflation.

How deflation situation occurs?

Deflation is a general decline in prices, often accompanied by a reduction in the money supply and credit. It is typically associated with economic contractions and can be more damaging than inflation because it can lead to a deflationary spiral.

There are 4 types of scenarios that lead to deflation:

A. Demand side deflation (not enough spending):

This is the classic recessionary deflation, where aggregate demand falls.

How it happens:

1. A shock hits to confidence or wealth like a stock market crash (1929 or 2008) wipes out household wealth, a housing bubble bursts (2007-2008) or a geopolitical crisis or pandemic (COVID-19 initially) causes fear and uncertainty.

2. The psychology of fear takes over. People see their all savings vanish. People lose jobs or fear losing them, so they save more and spend less. They think, I must save every penny. No big purchases. Businesses see falling demand and postpone investments, cancel orders, and lay off workers.

3. During this time spending freeze. With less spending, the demand for goods and services falls. Sellers find themselves with excess inventory. Too many goods, not enough buyers. Car dealerships sit empty. Restaurants have no customers. Factories receive fewer orders.

4. Businesses starts prices cuts to clear inventory. To attract the few remaining buyers, businesses start slashing prices: 50% off everything. This is the beginning of deflation.

5. As prices fall, consumers delay purchases expecting even lower prices in the future (why buy today if it will be cheaper tomorrow?). This further reduces demand, leading to more price cuts, more layoffs, and so on.
e.g. The Great Depression of the 1930s.

B. Supply side deflation (too much supply):

This is when there is an excess of goods and services, often due to overproduction or technological advances.

How it happens:

1. A technological breakthroughs happens. New technology like automation, Al, better manufacturing techniques drastically reduces the cost of production and increases output. A company figures out how to make something much cheaper.
e.g. The price of electronics like TVs, computers has fallen over time due to technological progress. Flat screen TV technology improves. Manufacturing costs drop 50% in 2 years.

2. During boom times, businesses may overinvest in new capacity like factories,
machinery. When the boom ends, they are left with too much production capacity and must cut prices to use it.

3. Opening up to global trade can bring a flood of cheaper goods from countries
with lower production costs like China in the 2000s.

4. The increase in supply or reduction in production costs leads to falling prices. Competition forces price cuts: all TV makers adopt the technology and compete on price. TV prices fall from $1,000 to $400 while quality improves.

5. This is often good deflation, if it's gradual and accompanied by rising incomes. But if it's sudden and combined with weak demand, it can turn into bad deflation.

e.g. The period from 1870-1890 in the us (Long Depression) was marked by rapid industrialization and falling prices.

C. Debt Deflation:

How it happens:

1. During good times, everyone borrows heavily for mortgages, business loans. Too much debt built up in economy.

2. A small trigger causes panic like a few people default on loans or a shock like an asset price collapse causes defaults.

3. Now the deadly chain reaction starts. Banks get nervous and call in loans. People must sell assets like houses, stocks to repay debt. Mass selling causes asset prices to crash.

4. Here's the killer. The real value of debt rises because prices and incomes are falling, but the debt amount is fixed. You owe $500,000 on a house now worth $400,000. Your debt is now worth more in real terms because dollars are becoming more valuable as prices fall.

5. This leads to more defaults and a contraction in the money supply as loans are written off.

6. Even if the money supply doesn't shrink, if people and businesses hoard cash and spend less, the velocity, the rate at which money changes hands falls. You cut spending drastically to pay debt, this reduces demand causing more price drops, ultimately increases real debt burden further. This has the same effect as a reduction in the money supply.

e.g. It's like trying to climb out of a sinking quicksand pit. The more you struggle i.e. sell assets to pay debt, the deeper you sink i.e. prices fall further, making your debt heavier.

D. Monetary deflation (not enough money or money vanishes):

This occurs when the money supply itself shrinks, or when the growth of money supply is slower than the growth of economic output.

How it happens:

1. It happens during banking crisis like banks fail (1930s). Depositors lose savings. Loans are called in and and new loans are not made. Since most money is created by bank loans, the money supply contracts. Remember, loans create money. When loans are repaid or default on, money is destroyed.

2. The central bank raises interest rates too much, making credit expensive and reducing the money supply growth during a weak economy.

3. Result, there is literally less money in circulation. With fewer dollars chasing goods, prices fall.

In reality, it often combine elements of all three. For instance, the Great Depression had a demand shock i.e. stock market crash, a monetary contraction i.e. bank failures, and overproduction in agriculture and industry. In the great depression stock market crash wiped out wealth. People runs to bank to withdrew cash, banks failed, money supply shrank by 30%. Spending stopped causing unemployment hit 25%. Consumer prices fell 27% over 4 years. Mortgages and business loans became impossible to repay with falling incomes. A downward spiral that took a world war to fully escape.

Example: 

The great depression and the 2008 financial crisis. The Deflationary Spiral in Detail once started, deflation can feed on itself:

1. Consumers and businesses postpone spending and investment. They expected fall in prices.

2. The value of debt remains fixed in nominal terms, but incomes and revenues fall. Real debt burdens increase. This leads to defaults and bankruptcies.

3. As businesses fail, unemployment rises, leading to further reductions in demand.

4. Defaults cause bank losses, leading to a credit crunch, which further reduces the money supply.

5. Real estate, stocks, and other assets lose value, reducing collateral for loans and worsening the credit crunch.


To fight deflation, central banks:

1. Lower interest rates to near zero or even negative to encourage borrowing and spending.

2. It creates money to buy assets like government bonds to inject liquidity and raise asset prices.

3. It promises to keep rates low for a long time to manage expectations. However, if deflation becomes entrenched like in Japan in the 1990s-2000s, it can be very difficult to escape because nominal interest rates cannot go below zero by much.

Why Deflation is So Feared?

1. Debt becomes a death sentence: Your mortgage payment stays the same while your income falls.

2. Central banks lose their main tool: Interest rates can't go below 0% much (though negative rates exist).

3. It's hard to escape: Once the "wait-and-see" psychology sets in, it becomes a self-fulfilling prophecy.

4. Business investment dies: Why build a factory today when it will be cheaper to build tomorrow?

Inflation can be stopped by taking away the raising rates. Deflation is like trying to start a car in -30°C weather, the engine i.e. economy is frozen, and normal methods like lowering rates might not work. That's why central banks panic at deflation signs and why most prefer mild inflation, it's easier to control than deflation's vicious spiral.

How bank set interest rates? In inflation how lowering interest rates makes it increase flow of money and in deflation how raising interest rates makes it decrease flow of money ?

Let's digg deeper into the mechanics of monetary policy. Money is created through debt. When you take a loan from a bank, that money is newly created as a digital entry. It didn't exist before. Therefore, more new loans means more new money entering the economy. Interest rates are the primary on/off switch for the loan creation machine.

Imagine water level is total money flowing in the economy. Inflation situation is the tub is overflowing i.e. too much money chasing too few goods. Deflation situation is the tub is draining too low i.e. not enough money, so prices fall. The interest rate is the main faucet controlling how fast new water i.e. money enters the tub.

How does the central bank set the interest rate?

The central bank has a magical, exclusive faucet that only a few big commercial banks can use. The central bank announces: The rate at which banks can borrow from our special faucet is now X%." This is the policy rate. If it's expensive for bank A to borrow from the central bank, it will be more expensive for bank A to borrow from anyone else like other banks. Bank A, in turn, will charge you and businesses a higher rate for mortgages, car loans, and business loans. Conversely, if the central bank's rate is low, the whole chain gets cheaper. In short, the central bank doesn't set your mortgage rate directly. It sets the wholesale price of money for banks, and the retail price i.e. your loan adjusts automatically.

In inflation prices rises too fast. The tub is full and water is spilling over. Central bank raises the policy rate. It makes its special faucet expensive. Big banks now find it costly to borrow short term funds. To maintain profit, they raise the rates they charge everyone else. For business loan become so expensive. So they delay building new factory. They invest less. People postpone their plans to buy home. The flow of new money into the economy which created every time someone takes out a loan, slows down dramatically. The water level in the tub stops rising so fast. With less money chasing goods, price increases cool down.

High interest rates make borrowing painful. When borrowing is painful, the creation of new money via loans slows. The economy's money flow constricts.

In deflation, prices falls, people don't spend, jobs are at risk. The tub is draining dangerously low. Central bank lowers the policy rate. Its special faucet is now cheap. Banks can borrow cheaply, so they lower the rates they offer. Now business invest freely because loans became so cheap that they can finance new project for almost free. People borrow and spend more. Savers invest their money in stocks or a business instead of letting it sit. The flow of new money i.e. new loans speeds up. More money enters the tub. This increased spending and investment boosts demand, stops prices from falling, creates jobs, and reflates the economy.

Low interest rates make borrowing attractive and saving unattractive. This encourages people to move money from saving accounts into active use like spending, investing. The economy's money flow accelerates.

How banks know how much money to print?

You might think banks print money randomly or based on some fixed rule. It's not a random guess, nor is it simply about printing physical cash. It's a sophisticated, data-driven process tied to the central bank's core mandate of price stability. Over 90% of the money in modern economies is digital i.e. bank deposit. Printing money usually refers to the central bank increasing the monetary base i.e. physical cash plus bank reserves held at the central bank. This is done primarily through monetary policy tools.

Central banks adjust money supply by setting interest rates to hit inflation targets. Their ultimate goal is to manage the inflation target. Most central banks have an explicit target like 2% per year. If inflation is forecast to be too high, imagine 4%, the economy might be overheating. The central bank will reduce the growth of the money supply to cool down spending and investment. If inflation is too low or deflation is a risk, the economy might be sluggish. The central bank will increase the money supply to stimulate activity.

Central banks don't decide in a vacuum. They constantly monitor a wide array of real-time economic data:

· Inflation Measures: Consumer Price Index (CPI), Core CPI.

· Growth Indicators: GDP, employment figures, retail sales, manufacturing output.

· Labor Market: Unemployment rate, wage growth.

· Financial Conditions: Interest rates across the curve, credit growth, stock and bond market behavior.

· Global Factors: Exchange rates, commodity prices (like oil), growth in major trading partners.

Using complex economic models, central banks forecast where the economy and inflation are headed under current policies. These forecasts are their primary guide for action.

The main lever is the policy interest rate. To increase the money supply or stimulate the economy. They lower the policy rate. This makes borrowing cheaper for commercial banks, which then lend more to businesses and households. This increases the digital money supply i.e. bank deposits. The demand for physical cash may also rise slightly as a result. To decrease the money supply or cool the economy. They raise the policy rate. This has the opposite effect, tightening credit and slowing the growth of money.

The actual printing of banknotes is largely a passive, demand-driven operation. Commercial banks order cash from the central bank to meet their customers' withdrawal demands at ATMs and branches. The central bank prints and supplies the requested amount, while simultaneously withdrawing old, worn-out notes from circulation. This ensures the public's demand for physical currency is met, but it does not directly stimulate the economy, cash in a vault doesn't do much; it's cash spent that matters.

During severe crises like 2008 financial crisis, COVID-19 pandemic, when interest rates hit near zero, central banks resort to QE. This involves creating new digital reserves to buy large quantities of government bonds and other assets from the market. This directly injects a massive amount of new digital money into the financial system, aiming to lower long-term rates and encourage lending and investment.

Think of the central bank not as a printer, but as the manager of a giant, economy wide pizza party.

Your goal as the manager is for every slice of pizza to keep its value. You don't want slices to become super scarce, so expensive no one can eat or so plentiful that they're thrown away. You want just enough for everyone to be happily fed at a stable pace. This is price stability.

Instead of printing money, you control the flow of pizza tickets that people use to get slices. Most tickets are digital numbers on your phone. This is how most money works today. Our 95% money is digital. Paper only makes 5% of the money. Some people like physical tickets they can hold. You print these only when someone asks to convert their digital ticket into a paper one.

Now you're constantly watching the party. How will you decide, how much tickets you have to release.

Situation 1:
Are people fighting over slices? Is the price of a slice i.e. inflation shooting up? That means there are too many tickets chasing too few slices. You slow down the release of new tickets i.e. raise interest rates. This makes tickets harder to get, people spend less, and the frenzy calms down.

Situation 2:

Is pizza going uneaten? Are people not spending their tickets? Is the price of a slice falling i.e. deflation risk. That means there are too few tickets in circulation. You release more tickets i.e. lower interest rates. You make tickets easier to get, encouraging people to go get a slice.

You don't have a magic number. You have a feedback loop. You watch what's happening i.e. economic data and adjust the ticket flow i.e. interest rates, day by day to keep the party perfectly balanced.

What about printing paper tickets?

This is the easiest part. You don't decide this. If someone comes to you and says, "I want 10 of my digital tickets as paper tickets to keep in my wallet," you just fulfill that order. You print the paper tickets and give them out, while deducting the digital ones from their account. The total number of tickets in the system hasn't changed; only the form has.

In real world scenario, pizza slices are goods and services in the economy. Ticket value is the purchasing power of money i.e. inflation or deflation.

Releasing digital tickets means the central bank lowering interest rates, making it easier for commercial banks to create new loans, which become new digital money in someone's account.

Slowing ticket release means the central bank raising interest rates, making borrowing harder and slowing the creation of new digital money.

Printing paper tickets means the central bank physically printing cash to meet public demand at ATMs. It's a passive response, not an active economic stimulus.

In short, central banks decide how much digital money to create or destroy by setting interest rates, guided by an inflation target and a constant stream of economic data. The printing of physical cash is a technical, responsive operation to meet public demand, not the primary method for controlling the money supply. Their goal is to manage the total value of spending in the economy to keep inflation stable and predictable.

In deflation where goods are cheaper but people still don't buy them and how this scenario leads to less money in circulation?

Picture a situation where prices drop from $1000 to $800, which seems like a great deal, so logically people should buy more. But in deflation, people actually hold off on spending.

Actually overproduction leads to too many goods chasing too little demand. Businesses lower prices to clear inventory. But here's the catch, when consumers see prices falling, they might wait for even lower prices, reducing current demand. This waiting game slows down the entire economy. Businesses earning less revenue can't pay workers or invest, leading to layoffs and lower incomes. With less income, people spend even less, reinforcing the cycle. Also, debts become harder to repay because the real value of debt
increases, causing defaults and bank losses, which contracts credit further.

Imagine factories produce 1,200 widgets, but consumers only want 1,000 at the current price of $1,000. To clear inventory, Company A slashes its price to $900. Company B must follow to $880. Prices begin to fall across the board. Consumer see this and will think: this TV was $1,000 last month, now it's $900. If I wait another month, it might be $800. I'll wait. This is the single most destructive behavior in deflation. The expectation of falling prices destroys the urgency to buy today. Everyone becomes a bargain hunter waiting for the bottom. Demand doesn't just stay low, it slashes further.

Because people aren't buying, business revenues crash. With less revenue, businesses must cut costs to survive. They lay off workers. Unemployed people have no income. Cut wages and hours for remaining workers. Employed people have less income. They cancel investments like new factories and equipment. This means they don't spend money at other businesses like construction firms, machine suppliers, causing those companies to lay off workers too.

Most money in a modern economy is loan. Deflation makes debt crushingly heavier. Imagine you took a $500,000 mortgage when you had a good job. Now your house's value is falling and your income is cut. The real value of your debt has increased. You owe the same $500,000, but it's harder to earn the dollars to pay it because dollars are becoming more valuable and your income is down.

People and businesses default on loans. When they default, the bank's asset i.e. loan vanishes. Banks become terrified, stop lending, and call in existing loans. This destroys credit money from the system, drastically shrinking the money supply.

If more money chasing fewer goods then why we don't increase production of goods?

We should increase the production and that's the ideal long-term solution. The idea is correct in theory, but has practical limitations. Production takes time, isn't directly controlled by central banks, and can't respond quickly to demand shocks. When everyone suddenly wants fridges, you can't magically produce more instantly, but you can make loans expensive so people stop buying temporarily.

Central banks control demand, not supply. Their is distinction between monetary policy (central bank's job) and fiscal/supply-side policy (government's job)

Think of it like this: The Central Bank is the Demand Manager. Its only tools i.e. interest rates work by influencing how much money people and businesses have to spend. It can encourage people to spend more (lower rates) or force them to spend less (higher rates).

Increasing production is a supply side task. This is the job of businesses, entrepreneurs, and the government through policies like tax incentives for factories, investments in infrastructure, education, and technology.

Increasing production often can't fix inflation fast enough.

Building a factory takes years. Training workers takes months. Growing a wheat crop takes a season. Inflation can spike in a matter of months. A central bank can't tell farmers, Grow more wheat by next Tuesday. But it can raise rates next week to make it more expensive to get a loan to buy a car or a house, instantly reducing demand for those things.

You can't always just make more. There might be supply chain breakdowns like during COVID. A war that cuts off oil and wheat exports like the russia ukraine war. A shortage of skilled workers. Limited physical resources like semiconductor chips, lithium for batteries.

Sometimes, the more money isn't chasing everyday goods. It's chasing financial assets like stocks, houses, creating bubbles. Building more houses can help, but if cheap money is flooding into speculation, you need to turn off the money tap to pop the bubble before it crashes the whole economy.

How less spending actually reduces the money supply over time, not just instantly?

High rates don't just make people spend less; they actively destroy money by slowing loan creation and accelerating debt repayment. Money supply isn't static, it shrinks when loans are paid back faster than new ones are made. Raising interest rates doesn't just make people spend less, it actively starts to reduce the amount of money in circulation over time. The existing money doesn't vanish, but the flow reverses.