Answer:not having enough of one brand of soda in the store because of a sale
Step-by-step explanation:
Shortage means something is not enough to satisfy the available need at that particular period.
When the brand of soda is not enough because most people have bought it that means there will now be a shortage to give those other customers who will still want to buy the same soda brand.
In this case it was inevitable since when there is a sale people buy more than they usually buy in order to store it back in their houses and this lead to shortage.