GDP per capita and development a) One concern about GDP per capita has been that it doesn't account for subjective well-being. What is one (of the two ways we discussed) that subjective well-being is measured? (2 points) b) Briefly, what is the overall conclusion of recent research (by Sachs, Stevenson and Wolfers) about the relationship the relationship between GDP per capita and subjective well-being? (4 points) What if, in addition to the spillover you measured above, the program had a spillover onto boys. a) Would that bias the treatment effect measured by the RCT? Explain briefly. (4 points) b) Could such a spillover bias the treatment effect in Part 3? Explain briefly