Answer: because people do not find jobs instantaneously.
Explanation:
Full employment refers to an economic situation whereby the available labor resources in the economy are used in the most efficient way. It is when the highest amount of both the skilled and the unskilled labor in an economy are employed at a particular time.
It should be noted that full employment is not considered to be zero unemployment because there'll always be the minimum rate rate of unemployment which is the natural unemployment rate in such economy as people do not find jobs instantaneously.
