0 to buy more of something than you need or more than you can pay for:
People tend to overbuy when shopping for supermarket groceries.
So the argument that there is something which causes waste and overbuying in the existence of a terminal exchange is not sound.
They have had to stock up against a background of a certain growing shortage; and therefore they have tended to overbuy.
There was, it is true, a considerable amount of retail overbuying at the beginning of the war in anticipation of increased prices, but this has subsided.
