If aggregate demand were to expand, would there be sufficient spare capacity to allow aggregate supply to expand to meet the additional demand? This is the question addressed by the podcast and article below.
If there is plenty of spare capacity, policies to increase aggregate demand could help to take up the slack and thereby achieve economic growth – at least as long as spare capacity remains. In other words, in the short run the aggregate supply curve may be horizontal or only gently upward sloping at the current point of intersection with the aggregate demand curve. This is illustrated by point a in the diagram. A rightward shift in the aggregate demand curve would cause a movement along the aggregate supply curve to a new higher level of real national income (Y).
If, however, there is little or no spare capacity, an increase in nominal aggregate demand is likely to be purely inflationary, or virtually so. This would the case at point b in the diagram. Real national income cannot expand beyond the full-capacity level, YFC. Under such circumstances, any attempt by the government to stimulate economic growth should focus on the supply side and attempt to shift the aggregate supply curve to the right. Examples of supply-side policy include incentives to encourage research and development, incentives for the private sector to invest in new capacity and direct public investment in infrastructure.
Unemployment is not just caused by a lack of aggregate demand relative to aggregate supply. It may be the result of a mismatching of labour supply with the demand for labour. People may have the wrong qualifications or not be where the jobs are. Unemployment may co-exist with quite high levels of vacancies. There may be vacancies for highly qualified scientists, technicians or craftspeople and unemployment of people with low skills or skills no longer in high demand. The same may apply to capital equipment. There may be a shortage of high-tech equipment or equipment to produce goods in high demand and redundant older equipment or equipment in areas of declining demand.
Part of a comprehensive set of policies to tackle unemployment and achieve economic growth would be to focus on the whole balance of the economy and the matching of the demand and supply of inputs.
Podcast
Is there ‘spare capacity’ in the economy? BBC Today Programme, Evan Davis and Andrew Sentance (4/12/12)
Article
OBR’s supply pessimism could be the ruin of this government The Telegraph, Roger Bootle (25/11/12)
Data
Claimant count and vacancies dataset ONS (14/11/12)
Labour Market Statistics, November 2012 ONS (14/11/12)
Actual weekly hours worked ONS (14/11/12)
Usual weekly hours worked ONS (14/11/12)
Questions
- Distinguish between ‘unemployment’, ‘underemployment’ and ‘disguised unemployment’?
- To what extent does the level of unemployment provide a good measure of spare capacity?
- Is the UK economy suffering from a deflationary gap? If so, how would you measure the size of that gap?
- If there is substantial spare capacity, is expansionary fiscal policy the best means of achieving economic growth?
- What policies are likely to have both a positive supply-side effect and a positive demand-side effect?
- What constraints does the government face in attempting to boost aggregate demand?
- Why might policies designed to stimulate aggregate demand also increase supply capacity?
- What policies would you recommend for tackling the mismatching of the demand and supply of inputs?