Inflation
Deflation is the opposite: a sustained decrease in the general price level.
Key Distinction: A fall in the inflation rate (e.g., from 5% to 2%) means prices are still rising, but more slowly. This is disinflation, not deflation. Deflation only occurs when the inflation rate becomes negative.
Why does this matter?
- Inflation erodes purchasing power.
- Deflation can lead to a 'deflationary spiral' where consumers delay spending expecting lower prices, causing demand to fall further, leading to job losses and recession.
The basket includes items like food, fuel, housing costs (excluding owner-occupier mortgage interest payments), transport, and leisure. The weights assigned to each item reflect their importance in typical household expenditure.
CPI vs RPI:
Cambridge often tests the difference between CPI and the Retail Prices Index (RPI):
- CPI excludes owner-occupier housing costs (e.g., mortgage interest payments).
- RPI includes these housing costs.
- Consequently, RPI is typically higher than CPI. Examiners may ask you to compare trends or explain why RPI might show higher inflation during periods of rising interest rates.
A table shows the CPI for Year 1 is 100 and for Year 2 is 105.
Calculation:
Inflation Rate = \frac{CPI_{Year 2} - CPI_{Year 1}}{CPI_{Year 1}} \times 100
Inflation Rate = \frac{105 - 100}{100} \times 100 = 5%
Interpreting Weights:
If the weight of 'Food' in the basket increases from Year 1 to Year 2, it means consumers are spending a larger proportion of their income on food. This could be due to rising food prices or a change in consumption habits.
Common Trap:
Do not confuse the level of CPI with the rate of inflation.
- If CPI rises from 100 to 105, prices have increased by 5%.
- If CPI rises from 100 to 102, then to 104, the inflation rate has fallen (from 2% to 2%, wait, let's use clearer numbers).
- If CPI rises from 100 to 110 (10% inflation), then to 115 (4.5% inflation), the inflation rate has decreased even though prices are still rising.
Correction: A falling inflation rate (e.g., from 8% to 2%) means the speed of price increases has slowed. Prices are still going up, just more slowly. Only a negative inflation rate indicates falling prices (deflation).
Mistake: Confusing cost-push and demand-pull causes.
Correction:
- Demand-pull: Caused by excess aggregate demand (AD shifts right). 'Too much money chasing too few goods.'
- Cost-push: Caused by rising costs of production (AS shifts left). E.g., higher wages, oil prices, or taxes.
Why examiners accept this: Examiners look for the understanding that weights reflect expenditure patterns. If the weight of a good increases, it means households are spending a larger share of their budget on it. This is often due to relative price changes or income effects.
Example Phrase: 'The increase in the weight of fuel in the CPI basket indicates that consumers are allocating a larger proportion of their total expenditure to energy costs compared to previous years.'
Why examiners accept this: They want you to identify the specific component that causes the divergence. The key difference is housing costs for owner-occupiers.
Example Phrase: 'RPI is likely to be higher than CPI because it includes mortgage interest payments, which are sensitive to changes in interest rates, whereas CPI excludes these costs.'
Demand-Pull Inflation:
Occurs when Aggregate Demand (AD) grows faster than Aggregate Supply (AS), particularly when the economy is near or at full employment.
- Causes: Increased consumer confidence, lower interest rates, increased government spending, higher exports.
- Mechanism: AD shifts right. Firms raise prices because demand exceeds supply capacity.
Cost-Push Inflation:
Occurs when the costs of production rise, causing Aggregate Supply (AS) to decrease (shift left).
- Causes: Rising wages (wage-price spiral), increased raw material prices (e.g., oil), higher indirect taxes, stronger currency affecting import costs (if imports are inputs).
- Mechanism: AS shifts left. Prices rise as firms pass on higher costs to consumers.
Building on previous concepts:
Recall that in the AD/AS model:
- Demand-pull inflation is associated with a movement along the short-run aggregate supply (SRAS) curve as AD increases.
- Cost-push inflation is represented by a leftward shift of the SRAS curve.
Demand-Pull:
'Inflation caused by an increase in aggregate demand that outstrips the economy's productive capacity.'
Cost-Push:
'Inflation caused by a rise in the costs of production, leading to a decrease in aggregate supply.'
Key Indicator:
- If inflation is accompanied by high unemployment, it is likely cost-push (stagflation).
- If inflation is accompanied by low unemployment and high growth, it is likely demand-pull.
Savers:
- Harmed. The real value of their savings falls if the interest rate earned is lower than the inflation rate (negative real interest rates).
Lenders (e.g., Banks, Bondholders):
- Harmed. They are repaid in money that has less purchasing power than when they lent it.
Borrowers (e.g., Mortgage Holders):
- Benefit. They repay loans with 'cheaper' money. The real value of their debt decreases.
Workers:
- Mixed Impact.
- Fixed Income Workers: Harmed as their real wages fall if nominal wages do not rise as fast as prices.
- Negotiated Wage Workers: May benefit if they can negotiate wage increases that match or exceed inflation, preserving their real income.
Firms/Producers:
- Mixed Impact.
- Benefits: If firms can raise prices faster than their costs, profits may increase. Uncertainty may encourage early investment.
- Costs: Increased uncertainty makes planning difficult. 'Menu costs' (cost of changing prices) and 'Shoe-leather costs' (time spent managing cash) rise. Input costs may also rise.
Correction: Workers with strong bargaining power or index-linked wages may see their nominal wages rise in line with inflation, protecting their real income. The harm depends on the real wage (Nominal Wage / Price Level).
Mistake: Assuming borrowers always benefit.
Correction: Borrowers only benefit if their interest rate is fixed. If they have a variable-rate mortgage and the central bank raises interest rates to combat inflation, their repayments may increase significantly.
Why examiners accept this: They want a balanced evaluation. High inflation creates uncertainty, which discourages long-term investment. However, moderate inflation can stimulate demand and allow firms to adjust prices.
Example Phrase: 'While high inflation increases menu costs and uncertainty, potentially reducing long-term investment, firms with pricing power may benefit in the short term by increasing profit margins if they can raise prices faster than their input costs.'
Why examiners accept this: High inflation makes exports more expensive and imports cheaper, worsening the trade balance.
Example Phrase: 'High domestic inflation reduces the international competitiveness of exports, leading to a fall in export volume, while making imports relatively cheaper, increasing import volume. This contributes to a current account deficit.'
For Consumers:
- Reduced purchasing power (real income falls).
- Distortion of relative prices, leading to inefficient resource allocation.
For Workers:
- Uncertainty about future living standards.
- Potential for industrial action if wages lag behind inflation.
For Producers/Firms:
- Menu Costs: Cost of frequently changing price lists/catalogues.
- Shoe-leather Costs: Cost/time spent managing cash holdings to avoid holding depreciating assets.
- Uncertainty: Makes long-term planning and investment difficult, potentially reducing economic growth.
For the Economy:
- Redistribution of Wealth: From savers/lenders to borrowers.
- Current Account Deficit: If domestic inflation is higher than in trading partners, exports become less competitive and imports more attractive.
- Loss of Confidence: High or volatile inflation can reduce business and consumer confidence, leading to lower investment and consumption.
- Prices fall.
- Consumers delay purchases, expecting further price drops.
- Aggregate Demand falls.
- Firms cut production and lay off workers.
- Unemployment rises, reducing income and demand further.
- Prices fall again.
This is why central banks often target a low, stable positive inflation rate (e.g., 2%) rather than zero or negative inflation.
Monetary Policy involves the central bank changing interest rates or money supply.
How it works:
- The central bank raises interest rates.
- Cost of borrowing increases, so consumption and investment fall.
- Saving becomes more attractive.
- Aggregate Demand (AD) decreases (shifts left).
- Inflationary pressure is reduced.
Effectiveness:
- Pros: Can be implemented quickly; effective if inflation is demand-led.
- Cons: May cause a recession and unemployment; time lags mean effects may take 12-18 months to materialize; may not work if inflation is cost-push.
Supply-Side Policies aim to increase productive capacity (shift AS right).
Examples:
- Reducing indirect taxes on firms.
- Investing in infrastructure and education.
- Deregulation to reduce business costs.
Effectiveness:
- Pros: Can lower prices by increasing supply; improves long-term economic growth and competitiveness; addresses the root cause of cost-push inflation.
- Cons: Takes a long time to implement (long time lags); may be expensive for the government; effectiveness depends on the type of policy.
Impact on Inflation:
- Increases Inflation: Imports become more expensive. If the economy relies on imported raw materials, this causes cost-push inflation.
- Reduces Inflation? No, typically devaluation increases inflation in the short term by raising import prices. However, it may help correct a current account deficit by boosting exports and reducing imports (if Marshall-Lerner condition holds).
Conclusion: Devaluation is generally not a policy to reduce inflation; it often exacerbates it. It is used to improve the balance of payments.
Reasons for targeting low, stable inflation:
- Avoids Deflation Risks: Prevents the deflationary spiral and associated unemployment.
- Reduces Uncertainty: Allows firms and consumers to plan for the future, encouraging investment and growth.
- Maintains Competitiveness: Prevents loss of international competitiveness due to high prices.
- Avoids Menu/Shoe-leather Costs: High inflation creates unnecessary costs associated with changing prices and managing cash.
Why examiners accept this: They want you to consider time lags, side effects (e.g., unemployment), and the type of inflation (demand vs. cost-push).
Example Phrase: 'While monetary policy is effective in reducing demand-pull inflation, it may be ineffective against cost-push inflation caused by supply shocks, as raising interest rates would further reduce aggregate supply and increase unemployment without addressing the root cause.'
Why examiners accept this: Students often confuse the goal of devaluation. It is for the current account, not inflation control.
Example Phrase: 'Devaluation may worsen inflation in the short term due to higher import prices, but it can help correct a current account deficit by making exports more competitive and imports more expensive.'
- Deflationary Spiral: Consumers delay spending, causing AD to fall, leading to job losses and recession.
- Real Debt Burden: The real value of debt increases, making it harder for borrowers (households/firms) to repay, leading to defaults.
- Wage Rigidity: Nominal wages are hard to cut, so firms may lay off workers instead, increasing unemployment.
Arguments Inflation is More Harmful:
- Erosion of Savings: Savers lose purchasing power.
- Uncertainty: High inflation creates uncertainty, discouraging investment.
- Current Account Deficit: High inflation reduces export competitiveness.
Conclusion: Deflation is often considered more dangerous because it can lead to a self-reinforcing cycle of recession and unemployment that is difficult to reverse.
Explanation:
- If the inflation rate falls, the general price level rises more slowly.
- The real value of nominal debt (debt fixed in money terms) depends on the interest rate and inflation.
- However, if the question refers to a fall in the inflation rate (disinflation), it often implies tighter monetary policy (higher real interest rates).
- Key Point: If inflation is lower than expected, lenders benefit and borrowers (including the government) are harmed because they repay with money that has more value than anticipated.