There are various definitions of economics. The early economists called economics 'the science of wealth.' According to Adam Smith, economics is concerned with 'an enquiry into the nature and causes of wealth of nations'.
Marshall shifted the emphasis from 'wealth' to 'welfare'. He defined economics as the study of mankind in the ordinary business of life.
According to Lionel Robbins, 'Economics is the science which studies human behavior as a relationship between ends and scarce means which have alternative uses.' It is the scarcity definition of economics.
Ends here refer to human wants, which are the scarce resources to satisfy these wants and they can be put to alternative uses.
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