In the business world one must be agile to stay in the race. While an item is “hot” it must be on your burner but not too much that it goes on fire within your eye’s. Buying just the right inventory at the correct time therefore is key. Shortages bring opportunity to stock up but they will come to an end and then your stock might turn out less then a gal of oil where you’ll have to pay to get rid of it.  Therefore one must be nimble  enough to act yet careful enough that time still stays on their side. Today it is N95 masks or replica of said item that is burning up the market place yet within months the big boys (3M, Honeywell) will bring out their inventory so guessing on the right side will allow one to feel the heat or be burned.