The equilibrium price is the price at which the quantity demanded by consumers equals the quantity supplied by producers. At this price, there is no surplus (excess supply) and no shortage (excess demand), so the market "clears" - every unit offered for sale finds a buyer.
For this reason, another term for equilibrium price is the market clearing price.
Demand price refers to the maximum price a consumer is willing to pay for a given quantity, which is not the same as the equilibrium price unless it happens to coincide with the supply price. "Satisfactory price" is not a standard economic term. A price floor is a government-imposed minimum price set above the equilibrium to protect producers (as in minimum wage legislation or agricultural price supports), which is the opposite of the market-determined equilibrium.
In examinations, if you see "equilibrium price," "market clearing price," or "market price" used interchangeably, they all refer to the point where the demand and supply curves intersect.
