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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. The 1% Club (American game show) - Wikipedia

    en.wikipedia.org/wiki/The_1%_Club_(American_game...

    The 1% Club is an American game show, with its setup identically based on the British game show of the same name.Contestants are given a very short amount time to solve brain teaser questions, with questions getting significantly more difficult as the game continues, as statistically a progressively smaller percentage of people, according to the producers, answered each subsequent question ...

  4. Vitality curve - Wikipedia

    en.wikipedia.org/wiki/Vitality_curve

    The often cited "80-20 rule", also known as the "Pareto principle" or the "Law of the Vital Few", whereby 80% of crimes are committed by 20% of criminals, or 80% of useful research results are produced by 20% of the academics, is an example of such rankings observable in social behavior.

  5. List of countries by percentage of population living in poverty

    en.wikipedia.org/wiki/List_of_countries_by...

    Only countries for which sourced data is available are listed. Data for some countries, including Libya and Saudi Arabia, remains unavailable. It was usually accepted that over one third (33.3%) of the population in Libya and Saudi Arabia were living in the previous decade below the poverty line. [9][10]

  6. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

  7. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.

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