EC140 Lecture 3: Lecture 3 - January 14, 2019

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14 Jan 2019
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There are many interest rates rates on bonds, treasury bills, on savings accounts, on mortgages, on gics one day, 7-day, 10 year loans. In macroeconomics, because all these interest rates move together and vary for reasons of risk, time to maturity, by currency of denomination. We abstract that there is one interest rate. If i lend . 00 and the interest rate is 12% per year then i get . 72 back when my loan is repaid next year . . 00 is principal and sh. 72 is interest. What i really want to knows is when i lend that what have i given up today and what will i get back tomorrow i get 1. 12x6 = . 72. The question above is in real terms. In lending i did not eat 1 cherry pie. . 72 in year b, i can buy 1. 02 cherry pies. Thus i get my principal (one cherry pie) back and a bit more.

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