In a short yet economically valid manner, every person is a unit of consumption. The greater the number of people and the greater the purchasing power, the greater the growth in consumption. So, if one wanted to gauge economic growth, (growth in consumption driving economic growth), multiply the annual change in population by purchasing power (wages, savings) per capita. Regarding wage growth, I hold wages flat as from a consumption standpoint, wage growth is basically offset by inflation. Of course, there is another lever beyond this which central banks are feverishly torqueing; substituting the lower interest rates of ZIRP and NIRP to boost consumption from a flagging base of population growth.
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