Final answer:
The question seems to have an error as none of the provided options (increase in business taxes, decrease in import tariffs, decrease in government spending, increase in the money supply) demonstrate an expenditure-switching policy. An actual example of an expenditure-switching policy would be the implementation of import tariffs or quotas.
Step-by-step explanation:
An expenditure-switching policy refers to strategies used by a government to reduce the demand for imports and increase the demand for domestically produced goods. This is typically achieved through mechanisms such as tariffs, trade barriers, or currency devaluation, with the general aim of improving the balance of trade. The list you've provided includes various economic policies, but the one that exemplifies expenditure-switching would be a decrease in import tariffs.
However, since decreasing import tariffs would actually make imports cheaper and more competitive against domestic goods, it isn't a form of expenditure-switching policy. Thus, none of the options (A. an increase in business taxes, B. a decrease in import tariffs, C. a decrease in government spending, D. an increase in the money supply) provided are examples of expenditure-switching policies. Instead, these options represent various fiscal or monetary policies. Expenditure-switching policies would be more accurately represented by measures such as tariff increases or quotas on imports, which are designed to shift domestic consumption towards home-produced goods and services.