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Real and money interest rates (Chapter 4)

+1 vote
asked Nov 10, 2016 in BUS 2016H - Financial Mathematics by anonymous
reshown Nov 10, 2016 by simon_rigby

Suppose you invest R1 000 at time 0, a further R2 000 at time 4, and in return receive R4 200 at time 8. What real rate of interest have you earned, if the values of the relevant index are 100, 140 and 200 at times 0, 4 and 8 respectively?

I was going to use the formula i'=i-j/1+j but doesn't this only work if the inflation rate is constant throughout the period? What happens when the inflation rate changes during the period?

1 Answer

0 votes
answered Nov 10, 2016 by simon_rigby (4,220 points)
selected Nov 14, 2016 by Richard van Gysen
Best answer

Hint: calculate, using the index, the real value (in time 0 money) of the cash flows at time 4 and and time 8. Then calculate the yield earned on the fund, based on the real values instead of the nominal values.