" Just as the subsistence of the laborers who built the Pyramids was drawn not from a previously boarded stock, but from the constantly recurring crops of the Nile Valley; just as a modern government when it undertakes a great work of years does not appropriate to it wealth already produced, but wealth yet to be produced, which is taken from producers in taxes as the work progresses; so it is that the subsistence of the laborers engaged in production which does not directly yield subsistence comes from the production of subsistence in which others are simultaneously engaged. "

― Henry George , Progress and Poverty