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2. History of United States postage rates - Wikipedia

   en.wikipedia.org/wiki/History_of_United_States...

   Postal rates to 1847. Initial United States postage rates were set by Congress as part of the Postal Service Act signed into law by President George Washington on February 20, 1792. The postal rate varied according to "distance zone", the distance a letter was to be carried from the post office where it entered the mail to its final destination.

3. Marginal cost - Wikipedia

   en.wikipedia.org/wiki/Marginal_cost

   In economics, the marginal cost is the change in the total cost that arises when the quantity produced is increased, i.e. the cost of producing additional quantity. [1] In some contexts, it refers to an increment of one unit of output, and in others it refers to the rate of change of total cost as output is increased by an infinitesimal amount.

4. Opportunity cost - Wikipedia

   en.wikipedia.org/wiki/Opportunity_cost

   Opportunity cost, as such, is an economic concept in economic theory which is used to maximise value through better decision-making. In accounting, collecting, processing, and reporting information on activities and events that occur within an organization is referred to as the accounting cycle.

5. What deals you should be shopping at Walmart this week ... - AOL

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   You'll get free shipping and grocery delivery, savings on gas and prescriptions, exclusive access to major deals and more. (And by the way, those without Walmart+ still get free shipping on orders ...

6. Where to shop today's best sales: 25% off an iPad, 20% off ...

   www.aol.com/lifestyle/where-to-shop-todays-best...

   Le Creuset Signature Round Dutch Oven, 5.5 Quart. $336 $420 Save $84. Cook like Ina Garten this fall and winter with the queen's favorite 5.5-quart Dutch oven, now 20% off at Sur La Table. You can ...

7. 7 secret deals for Amazon Prime members only - AOL

   www.aol.com/lifestyle/7-secret-deals-for-amazon...

   Tocol 3-in-1 MagSafe Case for iPhone 16 Pro. $14 $25. Save $11 with Prime and coupon. If you just picked up the new iPhone 16 Pro, you're in luck. This MagSafe case protects your phone from all ...

8. 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 ...

9. The best Labor Day sales to shop at Amazon today: Get a ... - AOL

   www.aol.com/lifestyle/the-best-labor-day-sales...

   Ring Video Doorbell. $60 $100 Save $40. You can't put a price on having real peace of mind, but we'll gladly take 40% off — and considering this video doorbell has over 164,000 five-star ratings ...