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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WASHINGTON â The United States Postal Service today announced proposed price changes, including an increase in the price of a First-Class Mail single-piece letter from 46 cents to 49 cents.ighlights of the new single-piece First-Class Mail pricing, effective Jan. 26, 2014 include: 1  Letters (1 oz.) â 3-cent increase to 49 cents. 2  Letters additional ounces â 1-cent increase to 21 cents. 3  Letters to all international destinations (1 oz.) â $1.15.