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UTILITY ANALYSIS: A subset of consumer demand theory that analysis consumer behavior and market demand using total utility and marginal utility. The key principle of utility analysis is the law of diminishing marginal utility, which offers an explanation for the law of demand and the negative slope of the demand curve.

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INVESTMENT DEMAND CURVE: A graphical depiction of the negative relation between investment expenditures and the interest rate, based on the marginal efficiency of investment for different capital investment projects. This curve is derived by plotting, from high to low, the marginal efficiency of investment for all possible capital investment projects. Because firms select those projects with returns greater than the interest rate on financial capital, this marginal efficiency of investment curve traces out the investment demand curve.

     See also | investment expenditures | investment demand | interest rate | marginal efficiency of investment | physical capital | financial capital | Keynesian economics |


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PRINCIPLE

A generally accepted, verified, proven, fundamental law of nature. A principle captures a cause-and-effect relation about the workings of the world that has been tested and verified through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic principles.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for gnomes hiding in cypress trees.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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