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December 6, 2025 

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ARBITRAGE: Buying something in one market then immediately (or as soon as possible) selling it in another market for (hopefully) a higher price. Arbitrage is a common practice in financial markets. For example, an aspiring financial tycoon might buy a million dollars worth of Japanese yen in the Tokyo foreign exchange market then resell it immediately in the New York foreign exchange market for more than a million dollars. Arbitrage of this sort does two things. First, it often makes arbitragers wealthy. Second, it reduces or eliminates price differences that exist between two markets for the same good.

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NATURAL MONOPOLY: A special type of monopoly that's able to lower its price when it produces and sells a larger quantity. This somewhat remarkable ability results because a natural monopoly uses a great deal of capital. In that capital carries an up front cost that must be paid regardless of production, a natural monopoly can spread these costs over larger quantity--if it produces more. The larger the quantity sold, the lower the cost for each unit. A single natural monopoly is thus able to produce and supply a good at a lower cost, and price, than two or more firms. In other words, if two or more firms try to supply the same good, the market will "naturally" end up with just one.

     See also | monopoly | market control | capital | regulation | average-cost pricing | marginal-cost pricing | industry regulation | regulation | public utility |


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ASSUMPTIONS, KEYNESIAN ECONOMICS

The macroeconomic study of Keynesian economics relies on three key assumptions--rigid prices, effective demand, and savings-investment determinants. First, rigid or inflexible prices prevent some markets from achieving equilibrium in the short run. Second, effective demand means that consumption expenditures are based on actual income, not full employment or equilibrium income. Lastly, important savings and investment determinants include income, expectations, and other influences beyond the interest rate. These three assumptions imply that the economy can achieve a short-run equilibrium at less than full-employment production.

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