Suppose that the price of refrigerators always changes at the rate of the economy's inflation. A refrigerator sells for $1,100 today, but the same refrigerator sold for $1,000 one year ago. A bank deposit of $100 a year ago earned 4% interest over the last year. What is the real interest rate over the past year?
Use the equation, NOT the approximation (rho= interest rate - inflation) for a "helpful" answer.
The exact answer is -5.45 and the estimate is -6%.