Sources:
www.study.com
blog.udemy.com
http://www.tutor2u.net/economics/gcse/revision_notes/basics_production_distribution_consumption.htm
https://www.marxists.org/archive/marx/works/1859/critique-pol-economy/appx1.htm
http://www.neda.gov.ph/
http://globaledge.msu.edu/countries/philippines

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