What is a core belief of Keynesian Economics regarding free markets?

Keynesian Economics, developed by John Maynard Keynes during the Great Depression, fundamentally critiques the notion that free markets operate efficiently on their own. A core belief of this economic theory is that free markets can lead to economic inefficiencies, particularly during times of economic downturn when aggregate demand is insufficient. In such instances, markets may fail to self-correct, resulting in prolonged periods of unemployment and underutilized resources.

Keynes argued that government intervention is necessary to boost demand and stabilize the economy. This perspective emphasizes the importance of proactive fiscal policies, such as government spending and tax adjustments, to counteract the adverse effects of economic slumps. The belief in potential market failure and the need for intervention distinguishes Keynesian Economics from classical economic theories, which typically maintain that markets are self-regulating and efficient without external interference.

The other options suggest that markets are either perfect, should be unconditionally prioritized, or need constant monitoring, which does not align with the Keynesian view that recognizes the shortcomings of free markets in certain economic conditions.