Definition
Supply-side economics is a school of policy thinking that holds the best way to grow an economy is to expand its capacity to produce, not to boost spending. It emphasizes incentives — what makes people work, save, invest, and start businesses — over the management of aggregate demand.
The approach rose to prominence in the late 1970s and 1980s as a response to stagflation, when demand-focused remedies seemed unable to address the era's mix of slow growth and high inflation.
Why it matters
How it works
Supply-side policy aims to shift aggregate supply outward. Lower marginal tax rates are meant to raise the after-tax reward for work and investment; lighter regulation is meant to cut the cost of producing and hiring; stable money is meant to remove inflation as a distortion.
If these measures genuinely raise productive capacity, the economy can grow faster without igniting inflation. Critics counter that the response of effort and investment to tax changes is often modest, and that aggressive tax cuts can widen budget deficits without delivering the promised growth.