Answer:
Macroeconomics.
Step-by-step explanation:
Filling In the gap in the question, we have;
''MACROECONOMICS is(are) concerned with how trade policy can affect unemployment''.
Macroeconomics is one of the branches in which economists divide economics, the other being microeconomics. Macroeconomics is the branch of Economics that deals with the study of the Behavior and structure in order to understand the economy. With this knowledge, macroeconomists are able to understand, explain prices of goods and services,
unemployment, and also relate how trade policy can affect unemployment. Without this branch of Economics,that is macroeconomics, it will be difficult to solve the problem of poverty(that is, poverty reduction).