There's nothing "super" about supermarkets. They are in fact, the opposite of "super".
Some basic questions:
Where does the food in the supermarket come from?
How far does the have to travel in order to reach my local supermarket?
How much energy is required for this journey?
In emergency situations where time is of the essence, can the food be moved faster?
In emergency situations where fuel is of the essence, can the food be moved more efficiently?
If I panic-buy all the monkey food at my local supermarket, does this mean that a child in Sendai can't feed her pet monkey?