The first thing you have to do is define what is scarcity and what is a shortage. Off the top of my head scarcity is when a resource is available in a finite quantity but on the other hand a shortage is when a popular product or resource is easy to get but supply doesn't satisfy the demand. So in lame mans terms
scarcity = When you dont have much of a resource at all
Shortage =You have the resource readily available but sometimes the supply doesn't meet the demand thus a temporary drop in the resource you want or need.
