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  2. 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 ...

  3. 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.

  4. Rationing in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Rationing_in_the_United...

    At the start of the Second World War in 1939, the United Kingdom was importing 20 million long tons of food per year, including about 70% of its cheese and sugar, almost 80% of fruit and about 70% of cereals and fats. The UK also imported more than half of its meat and relied on imported feed to support its domestic meat production.

  5. Steam (service) - Wikipedia

    en.wikipedia.org/wiki/Steam_(service)

    [a] In October 2018, Valve updated their policies that cut theirs to 25% once revenue for a game surpasses US$10 million, and further to 20% at US$50 million. [96] The policy change was seen by journalists as trying to entice larger developers to stay with Steam, [ 97 ] while the decision was also met with backlash from indie and other small ...

  6. Smartphone - Wikipedia

    en.wikipedia.org/wiki/Smartphone

    In Q4 2014, Apple had a 20.4% share and Samsung had 19.9%. [300] In Q2 2016, Samsung had a 22.3% share and Apple had 12.9%. [301] In Q1 2017, IDC reported that Samsung was first placed, with 80 million units, followed by Apple with 50.8 million, Huawei with 34.6 million, Oppo with 25.5 million and Vivo with 22.7 million. [302]

  7. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

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