6. Seven out of 10 students who attend US public colleges and universities leave the state where they studied after they graduate. This suggests that the states are losing a significant part of the return on their investments that subsidize higher education. Explain how it is possible that the states that pay the most in college education subsidies still gain economically from those subsidies. Assume that the same seven of 10 students who attend public colleges and universities in those states leave for other states. 7a. For a private insurer selling a particular annuity at a particular price, which types of buyers are worse risks? Compare healthier to less healthy buyers; older to younger buyers; richer to poorer buyers. b. Why do annuities sold by private insurers to 65 year old US buyers have premiums over 80% higher than what would be actuarially fair for the US population of 65 year olds. An actuarially fair premium for a given population of buyers is one that gives the insurer 0 average net revenue. The premium payments the insurer receives barely cover the annuity payouts the insurer must make on average. c. The number of workers per SS benefit recipient in the US is expected to decrease from about 3 to about 2 by 2045 . What are the three most important reasons for this expected decrease