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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. 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 ...

4. Rationing in the United Kingdom - Wikipedia

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

   Until the issuing of Clothing Coupon books for 1942-43, consumers were to surrender unused margarine coupons from their food ration coupon book when buying clothing. [44] Initially people were allocated 66 points for clothing per year; in 1942, this was cut to 48, in 1943 to 36, and in 1945–1946 to 24.

5. Steam (service) - Wikipedia

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

   Steam Coupons, which was introduced in December 2011, provides single-use coupons that provide a discount to the cost of items. Steam Coupons can be provided to users by developers and publishers; users can trade these coupons between friends in a similar fashion to gifts and in-game items. [ 81 ]

6. Half dollar (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Half_dollar_(United_States...

   The half dollar, sometimes referred to as the half for short or 50-cent piece, is a United States coin worth 50 cents, or one half of a dollar.In both size and weight, it is the largest circulating coin currently minted in the United States, [1] being 1.205 inches (30.61 millimeters) in diameter and 0.085 in (2.16 mm) in thickness, and is twice the weight of the quarter.

7. Notre-Dame de Paris - Wikipedia

   en.wikipedia.org/wiki/Notre-Dame_de_Paris

   Notre-Dame de Paris (French: [nɔtʁ (ə) dam də paʁi] ⓘ; meaning " Our Lady of Paris "), referred to simply as Notre-Dame, [ a ] is a medieval Catholic cathedral on the Île de la Cité (an island in the River Seine), in the 4th arrondissement of Paris, France. The cathedral, dedicated to the Virgin Mary, is considered one of the finest ...