25. Give one reasonable, quantifiable metric for each of the following: a. Economic hardship b. National heath c. School performance 26. Why does maximizing efficiency necessarily lead to inequality, in theory? 27. What is the Consumer Price Index (CPI)? Why do we need it? 28. Consider a regression in which the dependent variable is annual spending on gasoline in dollars and the independent variable is a binary indicator of whether the respondent lives in an urban or rural area. The variable=1 if the respondent lives in an TRRAN area and if the remaindent lives in a