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Algebra
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How does a step function apply to postage rates.

Jan 13th, 2015

When  y value  of a function f(x) remains constant for certain amount of increase in x value and then jumps to a higher value at another x value, then the function is called a step function This means that y value remains constant while x value increases and then at a certain point it suddenly takes a higher value.

Postage rates change  the same way.  Usually postage rate remains constant for a period of two to three years and then jumps to a higher rate.  For example, around 2012, first class mail stamp was at 43c .  Then around  2014, it increased to 49c.  This a step change of the rate from 43c to 49c between 2012 through 2014. So the y variable is the postage rate and x variable is the year.

Jan 13th, 2015

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Jan 13th, 2015
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