Institutions in the economy that help to match one person's saving with another person's investment are collectively called the a. monetary system. b. Federal Reserve system. Selected:c. banking system. This answer is incorrect. d. financial system.

d. financial system.

Explanation:

Based on the information provided within the question it can be said that the term that is being described here is a financial system. This is a system within the economy that encourages both saving and investing from the individuals within the economy, as well as allowing their funds to be allocated, invested, or moved between different economic sectors.

answer (b); /// a method of measuring the opinions of a large group of people by selecting a subset of the larger group, asking them a set of questions and then generalizing those responses;