Literature Recommendation: Advanced Undergraduate Economics
I would suggest Mankiw and EconTalk (despite my Keynesian leanings). 

Specifically Mankiw's text "Principles of Economics" is a great math-light introduction that covers both Macro and Micro. I recommend this edition particularly because you can get it new off Amazon for under $20, though of course the latest edition is best, but the field hasn't changed that much that I'd spend 15x as much to get it.

Additionally Stiglitz, Piketty, Buchanan, and Fama (particularly Fama, given your interest in finance), are all great authors, and in my opinion fairly accessible (in book, not in paper, they're each just as jargonated in paper as any one else).

Hope that helps.