| Causes of Inflation | Demand-Pull Inflation | Occurs when aggregate demand (AD) exceeds aggregate supply (AS). This can be due to increased consumer spending, government expenditure, or investment. Example: Economic growth leading to higher income levels and consumer spending. | Depends on the elasticity of AS. If AS is elastic, the increase in demand may not lead to significant inflation. Central bank policies and supply-side factors may mitigate demand-pull inflation. |
| Cost-Push Inflation | Caused by an increase in the cost of production (e.g., wages, raw materials), leading to a decrease in AS. Example: Oil price shocks increasing transportation and production costs. | The impact depends on the duration and magnitude of the cost increases. Central banks may raise interest rates to counteract cost-push inflation, but this can lead to lower economic growth. |
| Built-In Inflation | Results from a wage-price spiral where workers demand higher wages to keep up with rising prices, which in turn increases costs and leads to further inflation. | This type of inflation is often associated with a lack of confidence in the economy, leading to higher inflation expectations. It can be difficult to break without strong monetary intervention. |
| Causes of Deflation | Demand-Deficient Deflation | Caused by a fall in AD, often during a recession. Lower consumer confidence and reduced spending lead to a decrease in prices. Example: The Great Depression. | Deflation can be self-perpetuating, as consumers delay purchases expecting further price drops, leading to a deeper recession. Policies to stimulate AD (e.g., fiscal stimulus) are crucial but may increase public debt. |
| Supply-Side Deflation | Caused by an increase in AS, possibly due to technological advancements or reductions in the cost of production. Example: Deflation in the late 19th century due to industrialisation. | This type of deflation can be beneficial if it reflects productivity gains. However, persistent deflation may lead to lower investment as firms expect lower returns. |
| Consequences of Inflation | Reduced Purchasing Power | Inflation erodes the value of money, reducing consumers' purchasing power, particularly for those on fixed incomes. | The impact varies across different income groups. Central banks may raise interest rates to control inflation, but this can slow economic growth. |
| Menu Costs and Shoe Leather Costs | Firms incur costs from changing prices frequently (menu costs) and consumers spend more time and effort finding the best prices (shoe leather costs). | These costs are more significant in periods of high inflation and can lead to inefficiencies in the market. However, technological advancements (e.g., digital pricing) may reduce menu costs. |
| Uncertainty and Investment | High inflation creates uncertainty, discouraging long-term investment as firms are unsure about future costs and returns. | The extent of the impact depends on the stability of the inflation rate. Volatile inflation is more damaging than a stable, moderate inflation rate. |
| Consequences of Deflation | Increased Real Debt Burden | As prices fall, the real value of debt increases, making it more difficult for borrowers to repay loans, potentially leading to higher default rates. | This can lead to a banking crisis if defaults are widespread. Policy responses might include lowering interest rates, but this is less effective when rates are already low (liquidity trap). |
| Deflationary Spiral | Expectations of future deflation may lead to reduced consumption and investment, as consumers and firms delay spending. This further decreases AD, exacerbating deflation. | Governments may need to implement aggressive fiscal policies to counteract the deflationary spiral, but this can increase budget deficits. |
| Impact on Employment | Deflation can lead to higher unemployment as falling prices reduce firms' revenues and profitability, leading to layoffs. | The severity of unemployment depends on the flexibility of the labour market and government intervention. Long-term deflation may lead to structural unemployment. |