When an increase in government purchases increases the income of some people, and those people spend some of that increase in income on additional consumer goods, we have seen a demonstration of ?

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When an increase in government purchases increases the income of some people, and those people spend some of that increase in income on additional consumer goods, we have seen a demonstration of ?

A. The multiplier effects
B. supply side economics
C. None of these answers
D. The crowding out effect