answer:Economics by itself is interesting and has some broad lessons to teach us. But as you note, it is not exact and it is subject to various external forces, which makes much of it wishy-washy. The more interesting (to me) aspect of economics is the are of Behavioral Economics – why people act the way they do, when things might or might not be in their own economic self interest. I strongly suggest that you read Dan Ariely’s stuff: here is is his website:
http://danariely.com/ His first one (Predictably Irrational) was excellent. The second one was more of the same.