Economics
Menger used his “subjective theory of value” to arrive at one of the most powerful insights in economics: both sides gain from exchange. Unlike William Jevons, Menger did not believe that goods provide “utils,” or units of utility. Rather, he wrote, goods are valuable because they serve various uses whose importance differs. Menger also came up with an explanation of how money develops that is still accepted today. If people barter, he pointed out, then they can rarely get what they want in one or two transactions. If they have lamps and want chairs, for example, they will not necessarily be able to trade lamps for chairs but may instead have to make a few intermediate trades. This is a hassle. But people notice that the hassle is much less when they trade what they have for some good that is widely accepted, and then use this good to buy what they want. The good that is widely accepted eventually becomes money.
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