Rate of Inflation

`"Rate of Inflation" = (( "Ending CPI" )_"x+1" - ( "Innitial CPI" )_x)/ ( "Innitial CPI" )_x)`

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The rate of inflation formula measures the percentage change in purchasing power of a particular currency. As the cost of prices increase, the purchasing power of the currency decreases. The subscript "x" refers to the initial consumer price index (CPI) for the period being calculated, or time x. And such, subscript "x+1" would be the ending consumer price index for the period calculated, or time x+1.