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UNPLANNED INVESTMENT: Investment expenditures that the business sector undertakes apart from those they intend to undertake based on expected economic conditions, interest rates, sales, and profitability. Another term for unplanned investment is change in inventories, which result when aggregate expenditures differ from aggregate output. Unplanned investment can be either positive or negative, meaning business inventories can either rise or fall. Should unplanned investment occur, then actual and planned investment differ, aggregate expenditures are not equal to aggregate output, and the macroeconomy is not in equilibrium.

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COLLUSION, EFFICIENCY

Colluding oligopolistic firms generally produce less output and charge a higher price than would be the case for a perfectly competitive industry. The efficiency of colluding oligopolistic firms is essentially the same as that for monopoly. In essence, colluding oligopolistic firms function just as if the market is a monopoly. The price charged by the colluding firms is higher than the marginal cost of production and the quantity is less. Most notably, price is greater than marginal, a violation of the key condition for efficiency.

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Today, you are likely to spend a great deal of time looking for a downtown retail store looking to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for crowded shopping malls.
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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."
"As is our confidence, so is our capacity. "

-- William Hazlitt, essayist

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