In: Economics
You are considering purchasing a savings bond that will pay you $100 per year. The market interest rate currently is 5% per year.
(a) If this savings bond is a perpetuity (paying the same amount forever), what its price (or present value)?
(b) Suppose instead that the bond pays $100 per year for 20 years. What is its price in this case?
(c) The interest rate goes up, to 8% per year. What will happen to the price of the 20-year savings bond from part (b)? Explain how you reached your conclusion.
a) Present value = Cash flows Interest rate
Present value = $ 100 0.05
Present value = $ 2000
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b) Price = $ 100 (1+0.05)1 + $ 100 (1+0.05)2 + $ 100 (1+0.05)3 + $ 100 (1+0.05)4 + $ 100 (1+0.05)5 + $ 100 (1+0.05)6 + $ 100 (1+0.05)7 + $ 100 (1+0.05)8 + $ 100 (1+0.05)9 + $ 100 (1+0.05)10 + $ 100 (1+0.05)11 + $ 100 (1+0.05)12 + $ 100 (1+0.05)13 + $ 100 (1+0.05)14 + $ 100 (1+0.05)15 + $ 100 (1+0.05)16 + $ 100 (1+0.05)17 + $ 100 (1+0.05)18 + $ 100 (1+0.05)19 + $ 100 (1+0.05)20
Price = $ 1246.22
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c) If interest rate goes up to 8% per year
Price = $ 100 (1+0.08)1 + $ 100 (1+0.08)2 + $ 100 (1+0.08)3 + $ 100 (1+0.08)4 + $ 100 (1+0.08)5 + $ 100 (1+0.08)6 + $ 100 (1+0.08)7 + $ 100 (1+0.08)8 + $ 100 (1+0.08)9 + $ 100 (1+0.08)10 + $ 100 (1+0.8)11 + $ 100 (1+0.08)12 + $ 100 (1+0.08)13 + $ 100 (1+0.08)14 + $ 100 (1+0.8)15 + $ 100 (1+0.08)16 + $ 100 (1+0.08)17 + $ 100 (1+0.08)18 + $ 100 (1+0.08)19 + $ 100 (1+0.08)20
Price = $ 981.81
The price decreases when the interest rate goes up. The price and interest rates are inversely related to each other. When interest rate decreases, price increases and vice versa.