Question: Problems concern the future of the US Social Security Trust Fund, out of which pensions are paid. Figure 5.61 shows the rates (billions of dollars

Problems concern the future of the US Social Security Trust Fund, out of which pensions are paid. Figure 5.61 shows the rates (billions of dollars per year) at which income.

I(t), from taxes and interest is projected to flow into the fund and at which expenditures, E(t), flow out of the fund. Figure 5.62 shows the value of the fund as a function of time.

Decide when the value of the fund is projected to be a maximum using

(a) Figure 5.61

bn $/yr 1375 1175 975 775 2015 2017 2019 2021 Figure 5.61

(b) Figure 5.62

E(1) I(1) 2023 2025 t(year)

bn $/yr 1375 1175 975 775 2015 2017 2019 2021 Figure 5.61 E(1) I(1) 2023 2025 t(year)

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