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  2. Our tech writer's pick for best budget earbuds are 50% off ...

    www.aol.com/lifestyle/our-tech-writers-pick-for...

    If you have Amazon Prime, you’ll get free shipping, of course. Not yet a member? No problem. You can sign up for your free 30-day trial here. (And by the way, those without Prime still get free ...

  3. Price discrimination - Wikipedia

    en.wikipedia.org/wiki/Price_discrimination

    Grocery store coupons were usually available in the free newspapers or magazines placed at the entrance of the stores. As coupons have a negative relationship with time, customers with a high value of time will not find it worthwhile to spend 20 minutes in order to save $5 only.

  4. No such thing as a free lunch - Wikipedia

    en.wikipedia.org/wiki/No_such_thing_as_a_free_lunch

    TANSTAAFL: a plan for a new economic world order by Pierre Dos Utt (1949). The earliest known occurrence of the full phrase (except for the "a"), in the form "There ain't no such thing as free lunch", appears as the punchline of a joke related in an article in the El Paso Herald-Post of June 27, 1938 (and other Scripps-Howard newspapers about the same time), entitled "Economics in Eight Words".

  5. Universal Product Code - Wikipedia

    en.wikipedia.org/wiki/Universal_Product_Code

    A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

  6. This compact soundbar is getting rave reviews from shoppers ...

    www.aol.com/lifestyle/this-compact-soundbar-is...

    What reviewers say 馃挰. See why more than 15,600 five-star shoppers swear by this deceptively small soundbar. Pros 馃憤. Fans love the sound quality, comparing it to going to the movies.

  7. Price - Wikipedia

    en.wikipedia.org/wiki/Price

    Economic price theory asserts that in a free market economy the market price reflects the interaction between supply and demand: [2] the price is set so as to equate the quantity being supplied and that being demanded.

  8. No free lunch theorem - Wikipedia

    en.wikipedia.org/wiki/No_free_lunch_theorem

    The "no free lunch" (NFL) theorem is an easily stated and easily understood consequence of theorems Wolpert and Macready actually prove. It is weaker than the proven theorems, and thus does not encapsulate them.

  9. Price floor - Wikipedia

    en.wikipedia.org/wiki/Price_floor

    A price floor could be set below the free-market equilibrium price. In the first graph at right, the dashed green line represents a price floor set below the free-market price. In this case, the floor has no practical effect. The government has mandated a minimum price, but the market already bears and is using a higher price.

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