in a Keynesian viewpoint, the government must buy more output, employ more people and make more money available to stimulate the economy
The Keynesian theory advocated for an increased government expenditures (spending) and lowering of taxes for stimulation of demand for getting an economy out of the depression.
Hence, in a Keynesian viewpoint, the government must buy more output, employ more people and make more money available to stimulate the economy.
Therefore, the Option A, B and C is correct.
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