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 a price ceiling is set, then there must be a way to assign who gets the low supply of the product. Of course, since there is a legal limit on the price, the price can't simply be raised. Lottery: One way to distribute a product for which there is a shortage is to draw names out of a hat.