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Bernard Shaw's Remarkable Religion: A Faith That Fits the Facts

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Ethics, Economics, and Government 161<br />

Economic Rent<br />

Even if <strong>the</strong> market were competitive in <strong>the</strong> way imagined by free market<br />

<strong>the</strong>orists, things would not be so simple, for Supply, like Utility, has its<br />

margins. Just as Utility varies with individuals and with circumstances, <strong>the</strong><br />

efficiency of production varies. In many cases, as supply increases, efficiency<br />

drops. Nineteenth-century thinkers, including Shaw, assumed that<br />

this was virtually always true. Their reasoning was simple: imagine an<br />

uninhabited fertile valley; <strong>the</strong> first settlers will take <strong>the</strong> best, most productive<br />

land, and as o<strong>the</strong>rs move in <strong>the</strong>y will be forced to occupy increasingly<br />

less productive land. In competitive circumstances, demand tends to drive<br />

prices down to <strong>the</strong> level at which <strong>the</strong> producers no longer regard it worthwhile<br />

to produce. If <strong>the</strong> land were all equally productive, that would be<br />

essentially subsistence level (assuming <strong>the</strong> farmers had no o<strong>the</strong>r employment<br />

opportunities). But in this case <strong>the</strong> price is driven down to <strong>the</strong> subsistence<br />

level at <strong>the</strong> least productive farms. By superimposing a graph of price<br />

and supply (margin of utility) on one showing cost and production (margin<br />

of supply) we determine <strong>the</strong> actual exchange value in a particular market:<br />

<strong>the</strong> point where marginal utility meets <strong>the</strong> margin of supply.<br />

price<br />

cost<br />

price/supply<br />

cost/production<br />

production/supply<br />

The unbroken line, showing <strong>the</strong> price (<strong>the</strong> vertical dimension) at a given<br />

level of supply (determined by <strong>the</strong> Final Utility and represented by <strong>the</strong><br />

horizontal dimension) tells us that <strong>the</strong> price will come down gradually<br />

until <strong>the</strong> market becomes glutted, when it begins to drop precipitously. For<br />

<strong>the</strong> broken line <strong>the</strong> vertical represents <strong>the</strong> cost of production at <strong>the</strong> least<br />

efficient sites and <strong>the</strong> horizontal <strong>the</strong> level of production. It tells us that (in<br />

this case) inefficiency rises more or less geometrically as more land is<br />

brought into production. As production and supply are commensurate, a<br />

horizontal line drawn on <strong>the</strong> graph anywhere to <strong>the</strong> left of <strong>the</strong> point at

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