Answer:
b. supply of dollars in the market for foreign-currency exchange shifts left
Explanation:
In the case when the expected return on the US assets should be rise while keeping other things constant so it reduced the dollar supply because the investors in US would begins switching the international investment to the domestic due to this it reduced the supply. This cause to shifting the supply curve to the left
Therefore the option b is correct
Due to scarcity. There exist unlimited wants but only scarce amount of resources to meet those wants so items must be allocated through a system of prices or through exchange.
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