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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

   Let time T be the number of draws needed to collect all n coupons, and let t i be the time to collect the i-th coupon after i − 1 coupons have been collected. Then T = t 1 + ⋯ + t n {\displaystyle T=t_{1}+\cdots +t_{n}} .

4. Greek austerity packages - Wikipedia

   en.wikipedia.org/wiki/Greek_austerity_packages

   The measures include: [5] 30% cuts in Christmas, Easter and leave of absence bonuses, a further 12% cut in public bonuses, a 7% cut in the salaries of public and private employees, a rise of the value added tax from 4.5% to 5%, from 9% to 10% and from 19% to 21%, a rise of the petrol tax to 15%, a rise in the taxes on imported cars of up to 10% ...