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  2. Registered mail - Wikipedia

    en.wikipedia.org/wiki/Registered_mail

    On 1 July 1858 the green sheet was replaced by a green silk ribbon and shortly afterward by a green linen tape. In 1870 the tape was replaced by green string. On the introduction of postal stationery registration envelopes in 1878 the string was replaced by printed blue crossed lines. The blue crossed lines have survived on registered letters ...

  3. Red envelope - Wikipedia

    en.wikipedia.org/wiki/Red_envelope

    A red envelope, red packet, hongbao or ang pau (traditional Chinese: 紅包; simplified Chinese: 红包; pinyin: hóngbāo; Pe̍h-ōe-jī: âng-pau) is a gift of money given during holidays or for special occasions such as weddings, graduations, and birthdays. [1]

  4. Apollo 15 postal covers incident - Wikipedia

    en.wikipedia.org/wiki/Apollo_15_postal_covers...

    Some of the envelopes were sold at high prices by West German stamp dealer Hermann Sieger, and are known as "Sieger covers". The crew of Apollo 15— David Scott , Alfred Worden , and James Irwin —agreed to take payments for carrying the covers; though they returned the money, they were reprimanded by NASA.

  5. Envelope theorem - Wikipedia

    en.wikipedia.org/wiki/Envelope_theorem

    In mathematics and economics, the envelope theorem is a major result about the differentiability properties of the value function of a parameterized optimization problem. [1] As we change parameters of the objective, the envelope theorem shows that, in a certain sense, changes in the optimizer of the objective do not contribute to the change in ...

  6. Cost to serve - Wikipedia

    en.wikipedia.org/wiki/Cost_to_serve

    Cost to Serve (CTS or C2S) is an accountancy and financial planning tool used to calculate the profitability of serving the needs of a particular customer account, based on the actual business activities and overhead costs incurred in servicing that customer or customer type. [1]

  7. Cubans resigned to rising costs as gas price soars overnight

    www.aol.com/news/cubans-resigned-rising-costs...

    Under the new pricing scheme, a single 40-liter (11-gallon) tank of fuel will cost 6,240 pesos, or about $20 at the black market exchange rate, well over the average monthly state salary in 2023 ...

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