supˌply and deˈmand noun [uncountable]
the relationship between the quantity of goods for sale and the quantity of goods that people want to buy, especially the way it influences prices:
the law of supply and demand

[TahlilGaran] Dictionary of Contemporary English ▲

supply and demand
the availability of something compared to the need or demand for something
The supply and demand for used sporting equipment is always very tight.

[TahlilGaran] English Idioms Dictionary ▲