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ENTRY BARRIER: An institutional, government, technological, or economic restriction 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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DISPOSABLE INCOME

The total income that can be used by the household sector for either consumption expenditures or saving during a given period of time, usually one year. Disposable income (DI) is one of three measures of income reported in the National Income and Product Accounts maintained by the Bureau of Economic Analysis. The other two are national income (NI) and personal income (PI). Two related measures of production are gross domestic product (GDP) and net domestic product (NDP).

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites looking to buy either a large green chalkboard shaped like the state of Maine or a replacement battery for your pocket calculator. Be on the lookout for crowded shopping malls.
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More money is spent on gardening than on any other hobby.
"Whenever an individual or a business decides that success has been attained, progress stops. "

-- Thomas Watson Jr., IBM executive

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American Assocation of Commercial Publications
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