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William observes that a car in 1925 sold for an average of $500 versus $20,000 for a 2005 model. He concludes that 2005 cars must be 40 times better than 1925 cars. What's wrong with this way of thinking?
On Jul 04, 2024
Poor William has made several errors. First, a 1925 car differs substantially from a 2005 car. As the saying goes, he is comparing apples and oranges. Second, the value of the dollar has declined; William, therefore, is using as his measure a unit that has changed sizes. This is like measuring one room with a 50-inch stick and another room with a 20-inch stick. We can give both measures in terms of sticks, but they are not very comparable.