A Prairie is a high Meadow between narrow mountain passes

A Prairie is a biome that is made up of scrub or grass. The grasslands have a temperate climate during the summer and cold during the winter, but not all the grasslands are the same, since there is a classification according to their vegetation and specific characteristics.

Explanation:

Supply and demand always change. If the demand in an object goes down, the supply will as well due to the fact that if no one wants an object, than who is going to buy it? If the demand goes up than so will the supply, because if more people want an object than the more people will need to supply it to keep it in stock.