IB Economics The Two Sides To Deflation

When Falling Prices Bring Bad News: The Truth About Deflation

Target Question:

"What is deflation in economics?"

Secondary Target Questions:

What is the difference between deflation and disinflation?

Why is deflation bad for an economy?

What is the Short-Run Phillips Curve?

What is the Long-Run Phillips Curve?

Why is the Long-Run Phillips Curve vertical?

What are the costs of deflation?

What is benign vs malign deflation?

You're in a shopping centre, and you see a sign in the window: "Prices falling - everything cheaper next month!" Do you buy now, or do you wait?

If you're a rational person, the answer is pretty obvious: you wait. Why spend £800 on a laptop today if the same laptop will cost £750 next month? And £700 the month after that?

Now imagine every single person in the economy making that calculation, every day, for every purchase they can delay. Multiply that across millions of households and thousands of businesses. Suddenly, nobody's spending. Shops aren't selling. Firms aren't earning revenue. Workers start getting laid off. The economy stops.

That's a suitable introduction to deflation - and the main reason why falling prices, despite sounding wonderful for consumers, can actually be one of the most dangerous economic conditions a country can face.

Deflation: Not All Falling Prices Cause The Same Effect

Deflation is a persistent fall in the general price level in an economy over a period of time - meaning the inflation rate turns negative.

Prices aren't just rising slowly. They're actually going down.

However, not all deflation is the same. So the reason prices are going down matters a great deal, and it determines whether deflation is relatively harmless or genuinely destructive. Economists split deflation into two types.

Benign Deflation: The Good Kind

Benign deflation happens when prices fall because the economy is getting more productive - not because it's collapsing. On the AD/AS diagram, this shows up as an outward (rightward) shift of the Short-Run Aggregate Supply (SRAS) curve. Firms can produce more, at lower cost, driving prices down. But real GDP goes up at the same time - from Y1 to Y2. Output rises, employment rises, and people can buy more goods and services at lower prices. Everyone wins.

So, Benign deflation is caused by an outward shift of the SRAS curve. It reduces the price level while increasing real GDP and is generally non-threatening to an economy.

IB Economics Real-life example: the technology sector. The price of computing power has been falling for decades, driven by innovation and efficiency gains. A smartphone today has more processing power than NASA's entire computer bank in 1969 - and it costs a fraction of what any comparable device would have in the past. That's benign deflation. Lower prices, driven by better technology, with no damage to output or employment.

Benign deflation is also great for exporters - when your production costs fall, your goods become more price-competitive abroad. Win-win.

Malign Deflation

Malign deflation is the worst possible scenario. Here, prices fall not because the economy is more productive, but because aggregate demand (AD) has collapsed. People are spending less, businesses are cutting back, confidence is low. The AD curve shifts to the left - from AD1 to AD2. As a result real national income falls from Y1 to Y2, and the general price level drops from PL1 to PL2. You get lower prices and a weaker economy simultaneously. Unemployment rises. GDP falls. It's a recession - and the deflation is the symptom of that recession, not a possible solution to it.

So, Malign deflation is caused by a leftward shift of the AD curve. It reduces both national income and the general price level, causing rising unemployment and falling real GDP.

Malign deflation can become self-reinforcing. Remember the shopping centre scenario from the opening paragraph? Once consumers start expecting prices to keep falling, they delay spending. Less spending means less revenue for firms. Firms cut wages and jobs. Workers spend even less. Prices fall further. Expectations of further price falls set in. Round and round it goes - what economists call a deflationary spiral.

IB Economics Real-life example: Japan fell into exactly this trap after its asset price bubble burst in the early 1990s, and the country spent over three decades fighting chronic deflation and economic stagnation. The phrase "Japan's Lost Decades" became a warning for the entire economics profession - a real-world case study in how difficult it is to escape from malign deflation once it takes hold of an economy. In fact, Japan has only recently - around 2025 - begun to show credible signs of recovering from it, yes, after thirty years.

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IB Economics Real-life example: China The Deflation Story

You want a live, real-time example of deflation? Look at China.

Since mid-2023, China's economy has been grappling with falling or near-zero prices. In 2025, China's headline inflation was essentially flat - 0.0% - one of the lowest rates on the planet. On the surface, that might sound stable. As it happens often in economics you look closer, and it doesn't look that good.

Some measures of the economy - such as the GDP deflator, which covers the entire economy rather than just consumer prices - have been declining for ten consecutive quarters. Sectors like steel, solar panels, and construction materials have seen prices collapse and that is certainly bad news.

The causes are associated to malign deflation: a severe property market slump (the housing sector accounts for a huge share of Chinese household wealth), persistently weak consumer confidence, and chronic long-term oversupply - China's factories are producing more than domestic consumers are willing to buy.

The parallels with Japan's Lost Decades are clear. "The deflationary problem is systemic," researchers at Rhodium Group have noted - and it is not something you can fix with a quick round of economic stimulus. China's government has tried trade-in programmes (give in your old phone, get a new one at a steep discount) and increased welfare spending to encourage consumption. The results, so far, have been modest. The problem is still very much there.

Meanwhile, China's solution of pushing its excess production capacity outward - exporting more, building factories in Southeast Asia, flooding global markets with cheap goods - is exporting deflationary pressure to the rest of the world. Europe and the US are already feeling the effects, which partly explains the wave of trade tariffs and import duties that have emerged in recent years. If a specific economy has a deflation problem it doesn't stay within its borders.

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Disinflation: Slower, Not Negative

Before we go further, let's make sure we establish a clear difference between disinflation and deflation.

They sound similar. They are not the same thing.

Disinflation:

Is when the rate of inflation falls - prices are still rising, just more slowly. The inflation rate is still positive. If inflation goes from 6% to 4% to 2%, that's disinflation.

Prices are going up - just at a decelerating pace.

Deflation:

Is when the inflation rate actually turns negative. Prices aren't just rising more slowly - they are falling.

So, Deflation occurs when there is a fall in the general price level and the rate of inflation is negative.

On the AD/AS diagram, disinflation looks like this: aggregate demand is still increasing (the AD curve is still shifting right), but it's increasing more slowly than before. National income continues to rise - from Y1 to Y2 to Y3 - and the price level keeps rising - PL1 to PL2 to PL3 - but each successive rise is smaller than the last. The economy is cooling down but not collapsing.

IB Economics Real-life example: The UK has been experiencing disinflation throughout 2024 and into 2025 and 2026. Inflation peaked at 11.1% in October 2022, fell steadily to around 3% by early 2026 - still above the Bank of England's 2% target, but prices are still rising, just much more slowly. That's disinflation. If it overshot and inflation went negative, that would be deflation. The risk is that if disinflation is not managed carefully, it can tip over into deflation - with all the negative consequences that follow.

Why Deflation Is Actually Worse Than Inflation

In most cases, deflation is more damaging to an economy than moderate inflation. Let's go through why.

Uncertainty and Deferred Spending

When consumers expect prices to keep falling, they delay purchases. Why buy a new car today if it'll be cheaper in six months? This deferred consumption slows economic activity, reduces business revenue, suppresses investment, and can prolong a recession significantly. Confidence collapses - and confidence is the fuel that keeps a consumer economy running.

The Real Value of Debt Increases

Perhaps the most damaging cost of all. When prices fall, the real value of debt rises.

Consider: if interest rates are 4% and inflation is -1%, the real interest rate is approximately 5%. Suddenly, every borrower - every mortgage holder, every business with a loan, every student with debt - is paying back more in real terms than they borrowed.

At a time when firms are earning less revenue and workers are earning lower wages, that's an extremely harsh context.

Think about it from a business perspective. Your revenues are falling because consumers aren't spending. But your debt repayments, in real terms, are rising. Perfect for insolvency. Mass bankruptcies become a real risk. Banks' loan books deteriorate. The financial system comes under stress. The whole thing can collapse and collapse fast.

Redistributive Effects

Deflation redistributes wealth - but not in a positive direction. Asset values fall: property prices, share prices, business valuations all drop. Meanwhile, the real value of debts rises. This hits debtors hard and benefits creditors - banks and wealthy savers end up better off in comparison to everyone else. Inequality widens.

Cyclical Unemployment and Bankruptcies

As aggregate demand falls and firms cut prices to survive, profit margins get squeezed. Firms respond by cutting costs - and the biggest cost for most firms is labour. Mass redundancies follow. Cyclical unemployment rises sharply. More unemployed workers means less spending, which feeds back into even weaker demand, completing the deflationary spiral.

Policy Becomes Ineffective

Normally, when an economy is struggling, the central bank cuts interest rates to stimulate borrowing and spending.

But interest rates can't go below zero. If the economy needs massive stimulus but the central bank is already at the zero lower bound, monetary policy runs out of room.

This is exactly what happened in Japan for decades, and what the European Central Bank had to deal with after the 2008 financial crisis. The usual toolbox stops working. And when the conventional tools don't work, governments are left hoping for alternatives - which are slower, more expensive, and less certain to succeed.

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The Phillips Curve: Can You Have Low Inflation AND Low Unemployment? (HL)

We are always better off avoiding both high unemployment and high inflation. But can governments achieve low levels of both at the same time? The Phillips Curve says: not always.

The Short-Run Phillips Curve (SRPC)

Back in 1958, New Zealand economist Alban William Phillips plotted UK data on wage inflation and unemployment going back almost a century. What he found was a clear inverse relationship: when unemployment was low, wage inflation was high - and vice versa. More jobs meant more consumer spending, which pushed prices up. Higher unemployment meant less spending, which kept prices down.

The Short-Run Phillips Curve (SRPC) formalises this trade-off. When the government boosts aggregate demand - cutting taxes, increasing public spending, lowering interest rates - employment rises and unemployment falls. But all that extra spending pushes prices up. You move up and to the left along the SRPC: lower unemployment, higher inflation.

So, The Short-Run Phillips Curve (SRPC) shows a potential trade-off between low unemployment and low inflation. As unemployment falls, wage inflation increases.

Equally, if you want to squeeze inflation out of the economy - raising interest rates, cutting government spending - you cool demand. Unemployment rises as firms cut back. You move down and to the right along the SRPC: lower inflation, higher unemployment.

At the natural rate of unemployment (NRU), inflation is zero. If unemployment falls below the NRU, wage inflation starts to accelerate. If unemployment rises above the NRU, deflation sets in - wage inflation goes negative - and you're in recession territory.

Reality dictates that governments can't often achieve both objectives simultaneously in the short run. It's a genuine trade-off.

The Long-Run Phillips Curve (LRPC): The Trade-Off Breaks Down

In the long run, the trade-off disappears entirely.

The Long-Run Phillips Curve (LRPC) is vertical. It sits at the natural rate of unemployment (NRU), and it says: in the long run, there is no stable trade-off between unemployment and inflation. Any attempt to keep unemployment artificially below the NRU will eventually be defeated by rising inflation expectations.

So, The Long-Run Phillips Curve (LRPC) is vertical at the natural rate of unemployment. In the long run, there is no trade-off between unemployment and inflation.

Here's why. Say the government cuts interest rates to boost demand and push unemployment below the NRU. For a while, it seems to work. But workers notice that prices are rising and start demanding higher wages to compensate. Firms' costs rise. They cut back on hiring. Unemployment drifts back up to the NRU - but now the economy has a permanently higher inflation rate embedded. The government achieved nothing in the long run except more inflation.

This is why most governments now focus not on pushing unemployment below the NRU but on reducing the NRU itself - shifting the LRPC to the left - through supply-side policies: retraining schemes, improving skills, reducing barriers to mobility, and creating better incentives to work.

Supply-Side Shocks and the Shifting SRPC

Supply-side shocks can shift the entire SRPC outward - making the trade-off worse. When Russia invaded Ukraine in 2022, energy prices spiked across Europe. That was a massive supply-side shock. It shifted the SRPC outward, meaning the UK and other affected economies faced higher inflation at every level of unemployment. The natural rate of unemployment effectively rose. That's precisely why central banks like the Bank of England were forced to raise interest rates aggressively - to shift back down a worsening trade-off curve.

Unemployment vs Inflation: Which Is Worse?

This is always one of the most interesting debates in macroeconomics - and the answer is: it depends on the context.

Both carry serious costs. High unemployment brings personal suffering, social breakdown, lost output, and fiscal pressure on governments. High inflation erodes purchasing power, hits the poorest hardest, destroys savings, and undermines business investment and international competitiveness.

Governments have to weigh those costs against their specific circumstances - and priorities shift over time.

IB Economics Real-life examples: During the COVID-19 pandemic from 2020, governments around the world prioritised employment above everything else. The risk of mass unemployment - with all its personal and social consequences - outweighed the risk of some demand-pull inflation from emergency stimulus spending. Furlough schemes, business loans, helicopter money - all of it pumped demand into economies to keep people in jobs. Of course, inflation came later but jobs were protected immediately.

Contrast that with Venezuela. Venezuela's inflation rate surged to 475% in 2025 - the highest in the world - driven largely by sanctions and political turmoil. Food and drink prices alone rose by 532% last year, rent increased by 340%, and healthcare by 445%. When inflation reaches those levels, it becomes the absolute priority - because hyperinflation destroys the basic functioning of an economy. People can't price goods rationally. Contracts become meaningless. Currency becomes worthless. It creates an absolute social disaster.

So, Hyperinflation is a rapid, out-of-control increase in prices, generally exceeding 50% per month, which destroys a currency's value and causes extreme economic instability. It is primarily caused by excessive money supply growth - often to fund government deficits - leading to a total loss of public confidence in the currency.

At 475% annual inflation, Venezuelans weren't worried about unemployment. They were worried about whether they'd be able to afford food by the end of the week.

The general principle: at moderate levels, unemployment is arguably the more immediate human priority - it hits individuals and communities hard and fast. But at extreme levels, runaway inflation is more economically destabilising. Most governments in stable economies try to keep both within manageable bounds - targeting low inflation while maintaining employment close to the NRU, and using supply-side policies to try to push both objectives simultaneously in a positive direction.

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IB Economics Summary

If you want to be a good economist learn this quickly: the opposite of a bad thing isn't always a good thing.

High inflation is bad. But that doesn't mean deflation is good. Low unemployment is the goal. But trying to push unemployment below its natural rate creates more problems than it solves. The economy is full of these paradoxes - and that's why it is so interesting.

China is learning the deflation lesson right now as we speak. Japan spent thirty years living under deflation. Venezuela is the best example of what happens when inflation goes completely out of control. And the UK is navigating the slow, difficult process of disinflation - bringing inflation back down without causing something worse.

IB Economics examiners are looking for you to understand why falling prices can be a danger sign, why the trade-off between unemployment and inflation is real but complex at the same time, and why the economic context determines which objective governments should prioritise - that's what you need from today's entry.

Frequently Asked Questions

What is deflation in economics?

Deflation is a persistent fall in the general price level in an economy, meaning the inflation rate becomes negative. It is typically caused either by a collapse in aggregate demand (malign deflation) or by an increase in aggregate supply from productivity gains (benign deflation). Malign deflation is far more damaging to an economy.

What is the difference between deflation and disinflation?

Disinflation is when inflation is still positive but falling - prices are still rising, just more slowly. Deflation is when the inflation rate is negative - prices are actually falling. The UK experienced disinflation between 2023 and 2026 as inflation dropped from 11.1% toward 3%. China, by contrast, has been experiencing deflation - actual falling prices - since 2023.

Why is deflation bad for an economy?

Deflation causes consumers to delay spending (waiting for prices to fall further), which reduces demand and economic growth. It increases the real value of debt, making it harder for borrowers to repay loans. It triggers cyclical unemployment, business bankruptcies, and a fall in asset values. It also makes monetary policy ineffective once interest rates hit zero - the "zero lower bound" problem.

What is the Short-Run Phillips Curve?

The Short-Run Phillips Curve (SRPC) shows the trade-off between unemployment and inflation in the short run. As unemployment falls (due to rising aggregate demand), inflation tends to rise because increased spending pushes up prices and wages. Conversely, higher unemployment reduces spending and keeps inflation low. The SRPC suggests governments cannot achieve both very low unemployment and very low inflation at the same time in the short run.

What is the Long-Run Phillips Curve and why is it vertical?

The Long-Run Phillips Curve (LRPC) is vertical at the natural rate of unemployment (NRU). It shows that in the long run, there is no trade-off between unemployment and inflation - any attempt to hold unemployment below the NRU simply results in accelerating inflation and in not lowering unemployment permanently. Workers adjust their wage expectations upward, pushing costs higher, and unemployment returns to the NRU with inflation permanently higher. Governments therefore try to reduce the NRU itself through supply-side policies rather than trying to move along the LRPC.

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More information about:

IB Economics Hub Page your IB Economics daily guide

IB Economics Macroeconomics Hub Page low inflation is one of the main macro objectives together with sustainable economic growth, low unemployment and equitable distribution of income

IB Economics Diagrams Page Check Unit 19 for All Inflation & deflation related diagrams and The Phillips Curve together with explanations

IB Economics Activity book Page Module 3 Macroeconomics Unit 3.12 for low inflation, deflation and the Phillips Curve exam practice, activities, model answers and IB Economics Marking schemes

IB Economics Aggregate Demand and Aggregate Supply - Direct relationship with both the AD leftward shift (malign deflation) and the SRAS rightward shift (benign deflation), revise this theory

IB Economics Fiscal Policy Hub Page for exploring in depth the government priority discussion at the end of the entry - COVID furlough schemes, Venezuela policy failures - as examples of fiscal responses to inflation/unemployment trade-offs.

IB economics Calculations Book make sure you check unit 19 for low inflation, deflation and the Phillips Curve calculations exercises, calculation exam-style questions, IB model answers, and IB marking schemes

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