How does a producer adjust the product price?
A.
If nobody buys a product at a particular price, he adjusts it higher.
B.
If some consumers buy it, but not enough to buy everything produced, producers must increase the price.
C.
If some consumers buy it, but not enough to buy everything produced, producers must increase the supply.
D.
Even if there is constant high demand for a product individual producers need to keep the price down.