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July 18, 2025 

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HERFINDAHL INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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MUTUAL FUND: A company that pools the funds of hundreds or thousands of individuals to purchase corporate stocks, bonds, or other financial assets. The objectives of pooling funds is to reduce transactions costs and provide professional management not otherwise available. The most common types of mutual funds are "open-ended," so called because there are no limits on the number of shares issued. Others are "close-ended" because they issue a fixed number of shares that are then traded around. Mutual funds give consumers the chance to get higher interest rates or returns on the financial investment than available through banks. They also provide the opportunity to participant in financial markets that are typically closed to smaller investors.

     See also | corporate stock | bond | interest rate | bank | financial markets | stock market | financial intermediary |


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MARGINAL RETURNS

The change in the quantity of total product resulting from a unit change in a variable input, holding all other inputs fixed. Marginal returns is an older and more generic term for marginal product. While marginal product has largely replaced marginal returns in most discussions of short-run production, the phrase does persist in a few terms like the law of diminishing marginal returns.

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Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a T-shirt commemorating the 2000 Olympics or a genuine fake plastic Tiffany lamp. Be on the lookout for telephone calls from former employers.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
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