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  2. Shrinkflation - Wikipedia

    en.wikipedia.org/wiki/Shrinkflation

    This graph shows decline in coin silver content over the history of the Roman Empire. Shrinkflation is a rise in the general price level of goods per unit of weight or volume, brought about by a reduction in the weight or size of the item sold. [citation needed] The price for one piece of the packaged product remains the same.

  3. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    Coin values can be modeled by a set of n distinct positive integer values (whole numbers), arranged in increasing order as w 1 through w n.The problem is: given an amount W, also a positive integer, to find a set of non-negative (positive or zero) integers {x 1, x 2, ..., x n}, with each x j representing how often the coin with value w j is used, which minimize the total number of coins f(W)

  4. Debasement - Wikipedia

    en.wikipedia.org/wiki/Debasement

    Debasement lowers the intrinsic value of the coinage and so more coins can be made with the same quantity of precious metal. If done too frequently, debasement may lead to a new coin being adopted as a standard currency, as when the Ottoman akçe was replaced by the kuruş (1 kuruş = 120 akçe), with the para (1/40 kuruş) as a subunit.

  5. 'Pawn Stars:' Why a rare coin worth six figures sold for much ...

    www.aol.com/entertainment/2014-12-12-pawn-stars...

    On History Channel's hit show "Pawn Stars," a man came in to sell a 1907 Saint-Gaudens double eagle $20 gold coin. The coins are extremely rare, and some of them have sold for more than $1 million ...

  6. Coinage Act of 1965 - Wikipedia

    en.wikipedia.org/wiki/Coinage_Act_of_1965

    So long as there was a shortage of coins, the Mint could strike dimes, quarters, and half dollars from .900 silver, but this authority was to end once the secretary certified there was an adequate supply of the new coins in circulation, and in any event five years after the law was enacted (thus, ending July 23, 1970).

  7. Cheerios effect - Wikipedia

    en.wikipedia.org/wiki/Cheerios_effect

    Light reflections reveal the curved water surface around the coins. Several coins have sunk to the bottom of the cup, showing that these coins normally do not float. In fluid mechanics , the Cheerios effect is a colloquial name for the phenomenon of floating objects appearing to either attract or repel one another.

  8. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    A coin struck using dies never intended for use together is called a "mule". An example is a coin struck with dies designed for different coin denominations, or a coin struck with two dies that both lack a minting year on them, resulting in a 'dateless' coin.

  9. Coin grading - Wikipedia

    en.wikipedia.org/wiki/Coin_grading

    Coin grading [1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted. Several grading systems have been ...

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