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VERIFIED PRINCIPLE: A generally accepted, verified, fundamental law of nature that has been tested against and verified with real world data. A verified principle begins as an hypotheses implied by a theory, which is then compared against real world observations. If the hypothesis is consistently supported by data, it achieves the rank "verified" principle. This should be contrasted with unverifiable axiom.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a birthday gift for your father that doesn't look like every other birthday gift for your father or a green fountain pen. Be on the lookout for slow moving vehicles with darkened windows.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Anyone who has never made a mistake has never tried anything new. "

-- Albert Einstein, physicist

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