Essentials of Economics 2nd Edition by Campbell McConnell, Randy Grant, Stanley Brue

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What is the formula for measuring the price elasticity of supply Suppose the price of apples goes up from $20 to $22 a box. In direct response, Goldsboro Farms supplies 1200 boxes of apples instead of 1000 boxes. Compute the coefficient of price elasticity (midpoints approach) for Goldsboro's supply. Is its supply elastic, or is it inelastic