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There's a long and involved discussion around this. Adam Smith defined a nation's wealth as "the annual labour and produce of the nation". Which the astute reader will note is a flow rather than a stock. Smith's editor Cannan makes just this observation. Simon Kuznets, who came up with GDP in 1934 when the United States (and much the rest of the world) suddenly discovered it had a pressing need to determine just how much stuff it was doing on a national basis, cautioned strongly about overreliance on the metric (there's some level of parallel here with Ansel Keys' cautions on his highly mis-used body mass index -- devising good, measureable, but proxy indices for a large, hard-to-measure thing, is hard. Going back to Smith, he also states unambiguously that the only use of money is to stimulate the exchange of consumable goods, a definition which raises all kinds of interesting questions. It's worth noting that Smith's economy essentially had three currencies: one aimed at retail, one at wholesale, one at finance. These were conducted in copper (pence), silver (shillings), and gold (guineas), respectively. That is, England had a tri-metallic system, and the values of the currencies floated, somewhat, relative to one another. Yet another aside: in a great many instances, the name of a currency devolves to either a unit of weight, a denotation of authority, or a description of quality. Pound, mark, penny, peso, frank, and sheckel are all units of weight. Real, crown, kroner, and the like, denote royal authority, and arguably terms such as Euro could be taken as equivalents. "Dollar" comes from "Thaller", that is, "Jochinsthaller", referencing the quality of silver coin mined at the town of Jochin in Germany. Guinea refered to African gold, and nickel to the metal originally comprising it. A principle exception to this rule are names based on subdivisions: dime, quarter, possibly "shilling" according to some etymologies, dinar, denarius. The question of how to measure net economic throughput strongly suggests a concept similar to that of biological or ecological metabolism. Leslie White, an anthropologist, suggested that civilisations and cultures be ranked according to their net energy consumption. Evidence I've seen suggests a very strong fit, though you'd likely want to impose an efficiency constraint. Just as a feverish animal's metabolic rate isn't a reasonable measure, you'd want a healthy economy's energy consumption. GDP and economics generally suffers greatly from incomplete cost and value accounting. |