The word "economic" is originally a greek word [oikos] that means "family, habitation, state" and the word [nomos] "knowledge and law" which means "household managing" or "state management". The economist uses the economical data and concepts in the job's context, or experienced person obtained certification in this subject. The classic definition of economics, defined by Lionel Charles Robbins in 1932, "Economics is a science which studies human behavior as a relationship between ends and scarce means which have alternative uses."