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.
Determining Quantity Supplied Under Regular Market Conditions. The optimal quantity supplied is the quantity that consumers are willing to buy all of the quantity supplied. To determine this quantity, known supply and demand curves are plotted on the same graph. On the supply and demand graphs, quantity is in on the x-axis and demand on the y-axis.