Revise Links between macroeconomic problems and their interrelatedness for Cambridge 9708 (10.2)

The Phillips Curve illustrates a key short-run trade-off facing macroeconomic policymakers. It shows an inverse relationship between the rate of inflation and the rate of unemployment. When the government uses expansionary demand-side policies to stimulate aggregate demand (AD), firms respond to higher demand by increasing output and hiring more workers, thus reducing unemployment. However, a tighter labour market increases competition for workers, pushing up wages. Firms may pass these higher costs onto consumers via higher prices (cost-push inflation), while higher AD also creates demand-pull inflation. This creates a difficult choice: policies aimed at achieving low unemployment may lead to higher inflation, and vice versa. This trade-off is primarily a short-run phenomenon; in the long run, the Phillips Curve is considered to be vertical at the Natural Rate of Unemployment (NRU).

A conflict often exists between achieving strong economic growth and maintaining a sustainable balance of payments position. When an economy grows, national income rises. This leads to an increase in consumption and investment, including spending on imported goods and services. The extent to which import spending rises depends on the marginal propensity to import (MPM). If a country has a high MPM, rapid economic growth can lead to a surge in imports. If this growth in imports is not matched by a corresponding growth in exports, the current account of the balance of payments will worsen, leading to a larger deficit or a smaller surplus. This forces a government to choose between stimulating the domestic economy and protecting its external balance.

The relationship between growth, inflation, and unemployment is central to macroeconomics. Rapid economic growth that exceeds the economy's long-run trend rate tends to reduce cyclical unemployment as firms hire more labour to meet rising demand. This relationship is sometimes formalised by Okun's Law, which suggests a negative link between the unemployment rate and the output gap. However, this same boom in aggregate demand, if it outstrips the growth in productive capacity (LRAS), will lead to demand-pull inflation. Conversely, a period of slow growth or recession will see cyclical unemployment rise, but inflationary pressures will likely ease. This demonstrates a core policy dilemma: stimulating growth to solve unemployment can ignite inflation, while fighting inflation can slow the economy and increase unemployment.

A country's domestic inflation rate relative to its main trading partners is a critical determinant of its international competitiveness and, consequently, its balance of payments. If a country's inflation rate is persistently higher than that of other nations, its exports become progressively more expensive for foreign buyers. At the same time, imports become relatively cheaper and more attractive to domestic consumers. This combination of reduced export demand and increased import demand will cause a deterioration in the current account balance. Therefore, maintaining low and stable inflation is not just a domestic priority; it is essential for preserving the international competitiveness of a country's goods and services and ensuring a sustainable external position.