which of the following is not an example of macroeconomics A constructing a city sewer system B tightening the family budget C cutting state income taxes D subsidizing corn farms

Macroeconomics is an economics branch that is concerned with the behavior, structure, performance, and decision-making of an economy as a whole. It tends to deal with high-level econometrics including those at a global scale. In contrast, microeconomics, tends to focus on how individuals make decision based on scarce resources.

Thus, from these explanations, the correct answer for the question is (B) tightening the family budget, which is a form of microeconomics.