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July 5, 2025 

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LAW OF INCREASING OPPORTUNITY COST: The proposition that opportunity cost, the value of foregone production, increases as more of a good is produced. This "law" can be seen in the production possibilities schedule and is illustrated graphically through the slope of the production possibilities curve. It generates the distinctive convex shape of the curve, making it flat at the top and steep at the bottom.

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DIAMOND-WATER PARADOX: The perplexing observation that water, which is more useful than diamonds, has a lower price. If price is related to utility, how can this occur? This paradox was first proposed by classical economists in the 19th century and was subsequently used as a stepping stone for developing the notion of marginal utility and the role it plays in the demand price of a good. The paradox is magically cleared up with an understanding of marginal utility and total utility. People are willing to pay a higher price for goods with greater marginal utility. As such, water which is plentiful has enormous total utility, but a low price because of a low marginal utility. Diamonds, however, have less total utility because they are less plentiful, but a high price because of a high marginal utility.

     See also | price | demand price | utility | marginal utility | total utility | consumer surplus | law of diminishing marginal utility | marginal utility-price ratio | marginal utility and demand |


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PRODUCER PRICE INDEX

An index of the prices domestic producers receive from selling their output. THE Producer Price Index (PPI) is actually one of several producer price indexes compiled and published monthly by the Bureau of Labor Statistics (BLS). Others track prices for different industries and goods. This is also one of several noted price indexes used to track economic activity. Others include the Consumer Price Index (CPI) and the GDP price deflator.

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Today, you are likely to spend a great deal of time watching infomercials looking to buy either a genuine fake plastic Tiffany lamp or a microwave over that won't burn your popcorn. Be on the lookout for high interest rates.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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