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OLIGOPOLY CHARACTERISTICS: The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.

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SLOPE, INVESTMENT LINE

The positive slope of the investment line is also termed the marginal propensity to invest (MPI). This slope is greater than zero but less than one, reflecting induced investment. The slope of the investment line affects the slope of the aggregate expenditures line and thus also affects the magnitude of the multiplier process.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for gnomes hiding in cypress trees.
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MPI
Marginal Propensity to Invest
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