Assume that an individual expects to work for 40 years and then retire with a life expectancy of an additional 20 years. Suppose also that the individual’s earnings increase at a rate of 3 percent per year and that the interest rate is also 3 percent (the overall price level is constant in this problem). What (constant) fraction of income must the individual save in each working year to be able to finance a level of retirement income equal to 60 percent of earnings in the year just prior to retirement?

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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Assume that an individual expects to work for 40 years and
then retire with a life expectancy of an additional 20 years.
Suppose also that the individual’s earnings increase at a rate
of 3 percent per year and that the interest rate is also 3 percent
(the overall price level is constant in this problem). What
(constant) fraction of income must the individual save in
each working year to be able to finance a level of retirement
income equal to 60 percent of earnings in the year just prior
to retirement?

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