Starting from a base (or reference) year, a price index Pt represents the price of the commodity bundle over time t. In base year zero, P0 is set to 100. If for example the base year is 1992, real values are expressed in constant 1992 dollars, based at 100 for 1992. Also imagine for example, that the price of the commodity bundle has increased in the first year by 1%, then Pt rises from P0 = 100 to P1 = 101.
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The prepaid Priority Mail envelope is $4.80 and can be purchased online in a lot of 10. USPS also offers ordinary letter sized envelopes. These are also charged the cost of postage plus a fee for the envelope which is around 5Â¢. You can purchase these one by one at your Post Office or you can order in boxes of 500 that are imprinted with your return address. There are also prepaid Aerograms for International Mail. Contact your local Post Office for the exact costs involved with Pre-Paid envelopes. Source(s): 24 year Postal Worker.