1. Why do you think macroeconomists focus on just a few key statistics when trying to understand the health and trajectory of an economy? Would it be better to try to examine all
possible data?

Macroeconomists focus on just a few key statistics such as inflation,unemployment, and GDP because they find it hard to focus on all the data in eachmarket. Thus, it will be difficult for them to examine every good or servicebecause it is time consuming and cumbersome.It will be better for economists to examine all the possible data though it will take muchtime. The economists thus, use the summary from the three measures above to getsome information of the economy as a whole.

Explanation:

Its called research, hope it helped ヾ(•ω•`)o

answer; /// i believe that the correct answer is (a) making presentations;

answer; john stuart mill's principle of utility is your answer; /// good luck