Economics of Prices

By Walter E. Williams
Human Events Online, 30th May 2006

Say you owned a small 10-pound inventory of coffee that you purchased for $3 a pound. Each week you'd sell me a pound for $3.25. Suppose a freeze in Brazil destroyed half of its coffee crop, causing the world price of coffee to immediately rise to $5 a pound. You still have coffee that you purchased before the jump in prices. When I stop by to buy another pound of coffee from you, how much will you charge me? I'm betting that you're going to charge me at least $5 a pound. Why? Because that's today's cost to replace your inventory.

Historical costs do not determine prices; what economists call opportunity costs do.

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