This C tutorial explains how to use the #define preprocessor directive in the C language. In the C Programming Language, the #define directive allows the definition of macros within your source code. These macro definitions allow constant values to be declared for use throughout your code. Macro definitions are not variables and cannot be changed by your program code like variables.
Price Ceilings. If the price ceiling is above the market price, then there is no direct effect. If the price ceiling is set below the market price, then a shortage is created; the quantity demanded will exceed the quantity supplied. The shortage may be resolved in many ways.
If demand is inelastic, we know that the increase in price will cause quantity demanded to fall just a little. When price goes up, quantity demanded goes down, but not by much. To be precise, when demand is inelastic, the percentage change in quantity demanded is smaller than the percentage change in price.f price goes up and quantity remains unchanged, total revenue will rise. But the second effect is that quantity in fact will not remain unchanged. When price goes up, the quantity demanded (and therefore the quantity sold) goes down. And by itself, the lower quantity causes total revenue to go down.