Introduction
Singapore, like many developed nations, faces significant economic challenges from its ageing population. As the proportion of elderly citizens rises, there is growing pressure on social services, healthcare systems and pension funds, while the economy faces potential labour shortages and slower growth. The effects can be analysed using both the Aggregate Demand-Aggregate Supply (AD-AS) model and the Production Possibility Curve (PPC). From an AD-AS perspective, an ageing population lowers aggregate demand (AD) through lower consumption and higher taxes, while also lowering aggregate supply (AS) through a shrinking labour force. From a PPC perspective, an ageing population may push the economy further inside its frontier and eventually shift the frontier inwards.
Impact on aggregate demand
An ageing population affects household consumption, taxation and government expenditure, leading to an overall fall in aggregate demand. As the working-age population shrinks, a larger proportion of the population consists of retirees who no longer earn wages. With lower disposable incomes, household consumption expenditure (C) falls, reducing aggregate demand. This decline in consumption slows business activity, potentially causing firms to cut back on investment and hiring.
A smaller working population also means a narrower tax base must support rising government spending on elderly care, pensions and healthcare. To finance these expenditures, the government may raise taxes, further reducing disposable income and private consumption. While private spending declines, the government is likely to increase its spending on social services, particularly healthcare and elderly welfare. This rise in government expenditure (G) offsets some of the fall in aggregate demand but may not fully compensate for the reduction in private consumption. The fall in private consumption is expected to exceed the increase in government expenditure, so aggregate demand falls overall. This leftward shift in the AD curve from AD0 to AD1 lowers economic growth from Y0 to Y1, reduces employment opportunities and may create deflationary pressures from P0 to P1.
Impact on aggregate supply
An ageing population also affects aggregate supply through changes in the labour force and productivity. A declining proportion of working-age individuals leads to a smaller labour force, reducing the quantity of labour available for production. This decline in productive resources lowers Singapore's productive capacity, shifting long-run aggregate supply (LRAS) leftwards from AS0 to AS1.
With a shrinking workforce, firms may face labour shortages, leading to higher wage costs as businesses compete for a limited pool of workers. Higher labour costs may discourage investment in labour-intensive industries, lowering short-run aggregate supply (SRAS) through increased costs of production. The decline in the working-age population reduces overall production potential, shifting both SRAS and LRAS leftwards. This results in lower national output and reduced long-term growth from Y0 to Y1, exacerbating Singapore's demographic challenges.
Impact on the production possibility curve
The Production Possibility Curve (PPC) illustrates how an ageing population affects resource allocation, employment and economic efficiency. As aggregate demand falls, firms produce less, lowering demand for labour and raising unemployment. This results in the economy operating at a point further inside the PPC, reflecting underutilisation of resources and lower productive efficiency, shown by a move from point A to point B.
Over the long term, as the working population declines and labour shortages persist, the overall productive capacity of the economy shrinks. This is represented by an inward shift of the PPC from PPC0 to PPC1, indicating a permanent loss in potential output due to demographic constraints. With fewer workers and a slower pace of innovation, Singapore's potential growth rate declines, reducing its long-term competitiveness. A declining workforce may also reduce foreign direct investment (FDI), as businesses look to invest in economies with a larger, younger workforce.
Conclusion
An ageing population presents significant economic challenges for Singapore, affecting both aggregate demand and aggregate supply while reducing the economy's overall productive capacity. The decline in aggregate demand, caused by lower consumption and higher taxes, results in slower growth. The reduction in aggregate supply, due to a shrinking labour force and rising business costs, further weakens Singapore's economic potential. From a PPC perspective, an ageing population leads to higher unemployment and underutilisation of resources, causing the economy to operate further inside its frontier and eventually shifting that frontier inwards.