Final answer:
Keynesian economics recommends government intervention to stimulate demand, typically through increased government spending or tax cuts, while supply-side economics advocates for lower taxes and less regulation to promote business investment and economic growth.
Step-by-step explanation:
Keynesian economics and supply-side economics are two different approaches to managing economic growth and stability. Keynesian economics focuses on government intervention through expansionary fiscal policy, such as tax cuts or direct increases in government spending, to stimulate consumption and investment, thereby shifting the aggregate demand curve to the right. In contrast, supply-side economics emphasizes reducing taxes and regulations on businesses and consumers as a way to encourage investment and economic expansion. Supply-siders believe these measures will increase the productive capacity of the country and spur growth. Keynesianism suggests government spending and intervention are key to stabilizing the economy, especially during a recession. Meanwhile, supply-side proponents argue for keeping revenue and economic decisions in the hands of businesses and consumers to stimulate the economy.