Economics - there are different ways to look at it, but essentially, it is the management and use of limited resources for maximum benefits (resources includes labour and time). What do you do?......well, you study how a optimal mix of resources will bestow most benefits to mankind, and how that will affect their lives.......in so doing, formulate policies for the management of the use of a country's resources, or that of a company(business).....so that they are not wasted...