Which statement about keynesian economics is not correct?

keynes argued that individual markets for goods and services were appropriate and useful when aggregate demand was too low.

in the aftermath of the great depression, many people—including many economists—became more aware of vulnerabilities within the market-oriented economic system.

some supporters of keynesian economics advocate a high degree of government planning in all parts of the economy.

keynes argued that individual markets for goods and services were appropriate and useful, but that sometimes that level of aggregate demand was just too low.