I cannot quite understand your eaning of "origin". If you mean the first one in history of economics to had done mathematical analysis, it was ricardo when he was working on his incomplete theory of labour.
But the first one to have done complete mathematical deuction was Thuen(not sure if I have spelled that wrong" a Gernman.
Please correct me if I have said anything wrong.
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classification of economics 1-Applied economics 2-Theoretical economics i)Welfare economics ii)Positive economics(i-Micro economics,ii-Macro economics,iii-Mathematical economics)
classification of economics 1-Applied economics 2-Theoretical economics i)Welfare economics ii)Positive economics(i-Micro economics,ii-Macro economics,iii-Mathematical economics)
Some advanced economics textbooks discuss development economics. One's local library should have a wide variety of economics books to check out and reasearch development economics.
You can find Solution Manual Mathematical Economics by A.C. Chiang for free at different websites.