As a result of the Great Depression, a view that become very widespread among economists and others in the 1940s and 1950s was that:

the government should avoid interfering with the economic system and thus prevent another depression.
the business cycle was uncontrollable.
the market was inherently unstable, and thus needed a large dose of government guidance.
wage-price controls were an effective way to deal with inflation.

The Keynesian multiplier model implies that the source of instability in the economy is in:

financial markets.
the market for money balances.
markets for goods and services.
resource markets.

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