Solve for the indicated variable. 
for 
Definitions:
Imports
Goods and services purchased from other countries for domestic consumption, often contrasted with exports.
Reaction Function
In economics, it represents how one economic agent's decision changes in response to another's action, especially in competitive markets or games.
Demand Function
A mathematical representation showing the relationship between the quantity demanded of a good and its price, along with other determinants.
Marginal Cost
Additional cost incurred by increasing product or service production by one unit, emphasizing the concept of incremental expenditure.
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