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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Cost of USPS Forever stamps to go up Sunday. The price of the first-class mail Forever stamp will be increasing for the first time since January 2014. It might be called a Forever stamp, but its price is anything but. The cost of mailing a one-ounce first-class letter will jump from 47 cents to 49 cents on Sunday. The last increase was in January 2014, according to the U.S. Postal Service. Postcards, letters mailed to other countries and heavier letters aren't affected.