I just finished reading a short book mixing economic theory, psychology, and philosophy: How Adam Smith Can Change Your Life: An Unexpected Guide to Human Nature and Happiness Hardcover by Russ Roberts. It was recommended by Ryan Holiday as part of "The Very Best Books [He] Read in 2014."
The book delved into Adam Smith's Theory of Moral Sentiments and brought out its main ideas and most essential passages and applied them to contemporary life. I enjoyed the author's personal tone and anecdotes, and a lot of the basic concepts rang true for me. In the same way that so many lessons from Ayn Rand connect philosophy to economics, it's clear how Adam Smith drew many of the same conclusions at the intersection of those two disciplines (or rather, how economics should be grounded in a sound philosophy).
Here are some of my main takeaways, and my full notes are below: