Answer:
It led to increased inflation in Spain.
Explanation:
During the second half of the 15th century, Precious metals (especially gold and silver) was used to as a commodity money that is used as a medium of exchange.
As more and more precious metal was sent from Americas to Spain, The value of that precious metal as a medium of exchange weakened. (since more people have the commodity money, but the amount of goods that can be bought in Spain did not increased)
This led to the increase of inflation in Spain. The price of goods massively increase since there are more people have commodity money to afford it. This led to an event which later known as the Spanish price revolution.