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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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INCOME ELASTICITY OF DEMAND

The relative response of a change in demand to a change in income. More specifically the income elasticity of demand is the percentage change in demand due to a percentage change in buyers' income. This notion of elasticity captures the buyers' income demand determinant. Three other notable elasticities are the price elasticity of demand, the price elasticity of supply, and the cross elasticity of demand.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for door-to-door salesmen.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"Time is the scarcest resource, and unless it is managed nothing else can be managed."

-- Peter F. Drucker

OECD
Organization for Economic Co-operation and Development
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