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August 22, 2026 

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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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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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The Business About INVESTMENT

I had fun that last time we wandered into Shady Valley's very own Happy-Time Gala-World Fun-Land Amusement Park, didn't you? Let's stroll through it again, just to see what adventures we might find. Okay, I admit to an ulterior motive. The Happy-Time Gala-World Fun-Land Amusement Park recently added a new ride -- the Cap'n Space Fright Whirl. If you thought the Monster Loop Death Plunge roller coaster was exciting, then you're in for a real treat with this one. My interest in the Cap'n Space Fright Whirl, however, is NOT from the standpoint of risking a recently eaten meal. On the contrary, I'm going to don my pointy-headed economist disguise and check out this mass of twisted metal and high-flying cages as a prime example of capital. In the process we might be able to gain some insight into the whys and wherefors of the thing we call investment.
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