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2. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. [6] Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to potential customers and placed in magazines ...

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. Ninety–ninety rule - Wikipedia

   en.wikipedia.org/wiki/Ninety–ninety_rule

   In computer programming and software engineering, the ninety-ninety rule is a humorous aphorism that states: . The first 90 percent of the code accounts for the first 90 percent of the development time.

5. Smartphone - Wikipedia

   en.wikipedia.org/wiki/Smartphone

   Japanese cell phones increasingly diverged from global standards and trends to offer other forms of advanced services and smartphone-like functionality that were specifically tailored to the Japanese market, such as mobile payments and shopping, near-field communication (NFC) allowing mobile wallet functionality to replace smart cards for ...