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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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INNOVATION PROFIT

Economic profit, the difference between the total revenue received by a firm and the total opportunity cost of production, that is attributable to innovation, the initial application of new products, technologies, or ideas. Innovation profit is one of two sources of economic profit. The other is monopoly profit that arises due to market control. The generation of innovation profit is an important incentive that by rewarding individual innovative behavior enables society-wide benefits from the resulting innovations.

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for celebrities who speak directly to you through your television.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"The tragedy of life is not so much what men suffer, but rather what they miss. "

-- Thomas Carlyle, Historian

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