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Agricultural economics The word economics has been derived from the Greek word OIKONOMICAS with OIKOS meaning house old and NOMOS meaning management. it is understand that the beginning was made by Greek philosopher Aristotle in his book economica focus that the field of economics deal with household management . Father of economics Adam Smith wrote book his wealth of nation. Adam Smith define economics as an enquiry in to the nature and cause of the wealth of nation. J S MiIL define economics  the practical science of production and distribution of wealth. JB says Economics is the science which treats the wealth. JE carinas Economics deal with phenomena of wealth. F A. Walker Economics is that body of knowledge which relates to wealth. J.M. Keynes he define economics as a study of administration of scarebresource and of the determinant of employment and income. ALFRED MARSHALL HE DEFINE ECONOMICS AS "ECONOMICS IS THE STUDY OF MANKIND IN ORDINARY BUSINESS O...