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2. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Coupons can be used to research the price sensitivity of different groups of buyers (by sending out coupons with different dollar values to different groups). Time, location and sizes (e.g. five pound vs. 20 pound bag) [12] affect prices; coupons are part of the marketing mix. [13] So is knowing about the customer. [14] [12]

3. April 20 - Wikipedia

   en.wikipedia.org/wiki/April_20

   Download QR code; Print/export ... April 20 is the 110th day of ... 1998 – Air France Flight 422 crashes after taking off from El Dorado International ...

4. December 20 - Wikipedia

   en.wikipedia.org/wiki/December_20

   Download QR code; Print/export Download as PDF; Printable version; In other projects ... December 20 is the 354th day of the year (355th in leap years) ...

5. 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").