Public goods can cause positive A externalities
B. productivity
C, economic growth
D. consumer reaction

Explanation:

externals

option a

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the answer is b.

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this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.