After the Second World War, shortages in resources $($e$.$g$.,$ metals, oil, coal$)$ led to a negative mindset. This mindset created new concerns regarding economic growth and population growth for the United States. The Paly Commission was tasked with developing $25-$year projections of economic resource growth; there was debate about population growth $($as set too low$)$ and resource use $($as set too high$).$ The commission decided to adjust the definition for scarcity by changing the measure of

$$ absolute scarcity of a resource to a relative, price$-$based definition of scarcity.

relative scarcity of a resource to an absolute$,$ price$-$basedfrjefinition of scarcity.

demand scarcity of a resource to a relative, price$-$based definition of supply scarcity.

relative supply scarcity of a resource to an absolute$,$ price$-$based definition of structure scarcity.