The Gross Domestic Product measures economic activity by summing up all the monetary transactions that occur in a nation. It is often used as an indicator of economic progress and the prosperity of an economy. Unfortunately, the GDP as an indicator is given more credence than its approximations warrant. An increase in GDP can actually reflect one (or a combination) of three things:

1. True increase in productivity and the amount of goods and services available to (and used by) the population.
2. Additional economic activity required because of natural or man-made disasters - for example, the replacement of windows required after an earthquake or protest.
3. The transformation of the relationships within a society from informal activity to business dealings. One example is the growing use of hired child-care providers to replace the caring of children by relatives.

Ironically, hiring a prostitute in Nevada increases GDP (and the illusion of prosperity) while sleeping with your wife does not (unless you pay her and report that fact). Unfortunately, the GDP is still being used to measure economic progress by the both the uninformed and those who should know better.