In the diagram, $A{D_1}$ is an economy’s initial aggregate demand curve.
What could cause the curve to shift to $A{D_2}$?

1 )
Businessmen have come to expect a lower rate of return on capital investment.
2 )
Domestic consumers have become more thrifty.
Exports have become more competitive in overseas markets.
4 )
The economy’s propensity to import has increased.
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