There is a lovely public lake where people enjoy taking their boats and families for recreation. Everybody enjoys the park more when the picnic, beach and toilet areas are clean but nobody enjoys cleaning up after themselves. In this scenario, we can expect the lake to be due to a a) dirty; positive externality
b) dirty; prisoner's dilemma
c) clean; positive externality
d) clean; prisoner's dilemma

Your sister turned 35 today, and she is planning to save $60,000 per year for retirement, with the first deposit to be made one year from today. she will invest in a mutual fund that's expected to provide a return of 7.5% per year. she plans to retire 30 years from today, when she turns 65, and she expects to live for 25 years after retirement, to age 90. under these assumptions, how much can she spend each year after she retires? her first withdrawal will be made at the end of her first retirement year.