Selling econ textbooks at half price. Great deal so prices are firm. The condition is "like new". I never used them because I thought I was going to econ grad school but decided to be an starving artist instead. Even if you don't like these books, feel free to buy them to help a fellow artist survive in the Bay Area. Mostly Harmless Econometrics: An Empiricist's Companion - $20 Mastering 'Metrics: The Path from Cause to Effect - $15 Causal Inference for Statistics, Social, and Biomedical Sciences: An Introduction - $25 Econometric Analysis of Cross Section and Panel Data (MIT Press) - $35 I take venmo or cash.