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  2. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

  3. History of printing - Wikipedia

    en.wikipedia.org/wiki/History_of_printing

    The history of printing starts as early as 3000 BCE, when the proto-Elamite and Sumerian civilizations used cylinder seals to certify documents written in clay tablets. Other early forms include block seals, hammered coinage, pottery imprints, and cloth printing. Initially a method of printing patterns on cloth such as silk, woodblock printing ...

  4. Tariff - Wikipedia

    en.wikipedia.org/wiki/Tariff

    The tariff average rate on imports of manufactured goods in 1875 was from 40% to 50% in the United States, against 9% to 12% in continental Europe at the height of free trade. In 1896, the Republican Party platform pledged to "renew and emphasize our allegiance to the policy of protection, as the bulwark of American industrial independence, and ...

  5. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

  6. Dutch East India Company - Wikipedia

    en.wikipedia.org/wiki/Dutch_East_India_Company

    Products. Spices, silk, porcelain, metals, livestock, tea, grain, rice, soybeans, sugarcane, wine, coffee, slaves. The "United East India Company", or "United East Indies Company" (also known by the abbreviation "VOC" in Dutch) was the brainchild of Johan van Oldenbarnevelt, the leading statesman of the Dutch Republic. Amsterdam VOC headquarters.

  7. Halftone - Wikipedia

    en.wikipedia.org/wiki/Halftone

    The first printed photo using a halftone in a Canadian periodical, October 30, 1869 A multicolor postcard (1899) printed from hand-made halftone plates. While there were earlier mechanical printing processes that could imitate the tone and subtle details of a photograph, most notably the Woodburytype, expense and practicality prohibited their being used in mass commercial printing that used ...

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