Why Economics?

This Video by American Economic Association answers this quite well.

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How Economics?

​Online Courses:
Coursera
edX

Online Tutorials, Notes & Course Materials:
​Open Courseware (MIT)
Logic: Notes + Exercises
Lecture Notes in Microeconomic Theory (by Rubinstein)

​FAQs on MA and Phd Economics:
PhD Applications and Admission Process (NYU)

Other links:
Be An Economist (LaTeX-enabled Forum for discussions)
Resources for Economists