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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Timeframe. The United States Postal Services reports that as of January 2011, it takes an average of one to three days for First-Class Mail to arrive at its destination. Priority Mail takes an average of one to two days to arrive, according to the USPS.USPS only includes the time a package stays in transit in their estimations.Packages dropped off at a post office during business hours usually leave that day. Packages dropped off after hours may take an additional day.riority Mail takes an average of one to two days to arrive, according to the USPS. USPS only includes the time a package stays in transit in their estimations. Packages dropped off at a post office during business hours usually leave that day. Packages dropped off after hours may take an additional day.