The Figure Below Shows the Demand (D) and Supply (S)

The figure below shows the demand (D) and supply (S) curves of cocoa in the U.S.Figure 21.4

-The gold standard fixes the:

A) future price of gold in terms of silver.
B) price of gold in terms of international currencies.
C) future price of silver in terms of gold.
D) money supply in terms of paper currency.
E) past exchange rate and the future exchange rate.