The percentage depletion deduction was conceived in 1932 based on the accepted corporate tax principle that business taxes should be reduced in scale as the value of company equipment, structures and other assets diminish over time.
William thought there must be a long compound German word for the way that large events in the world could affect your personal life: the scale was reduced to the point of insignificance, but the everyday effect was amplified.
Colombia has done especially well: partly because it switched from ineffective crop-spraying to large-scale manual eradication, its coca-growing land has been reduced by 60% in the last decade.