Shortly after we met, Warren Buffett loaned me this collection of New Yorker business articles from the 1950s and 1960s. I loved them as much as he did. Brooks’s insights about business have aged beautifully, and they are as true today as ever. I still go back to this book from time to time, and this year I had a chance to re-read the chapter on Xerox (which you can download free). Business Adventures is a neglected classic, and it’s still my favorite business book ever.

Capital sparked a fantastic global discussion this year about inequality. Piketty kindly spent an hour discussing his work with me before I finished my review. As I told him, although I have concerns about some of his secondary points and policy prescriptions, I agree with his most important conclusions: inequality is a growing problem and that governments should play a role in reducing it. I admire his work and hope it draws in more smart people to study the causes of, and cures for, inequality.

Studwell produces compelling answers to two of the greatest questions in development economics: How did countries like Japan, Taiwan, South Korea, and China achieve sustained, high growth? And why have so few other countries managed to do so? His answers come in the form of a simple—and yet hard to execute—formula: (1) create conditions for small farmers to thrive, (2) use the proceeds from agricultural surpluses to build a manufacturing base focused on exports, and (3) nurture both these sectors with financial institutions closely controlled by the government. The agriculture section of the book was particularly insightful. It provided ample food for thought for me as well as the whole Agriculture team at our foundation. And it left us thinking about whether parts of the Asian model can apply in Africa.

The hilarious follow-up to The Rosie Project, one of the best novels I’ve read in ages. There’s no sophomore slump here. Simsion brings back some of the best characters and gags from the first novel while also bringing in enough new elements to keep it fresh. It’s a funny novel that also made me think about relationships: what makes them work and how we have to keep investing time and energy to make them better. A sweet, entertaining, and thought-provoking book.

One of Smil’s books makes my list of favorites pretty much every year. This time it’s his look at the world’s use of materials, from silicon to wood to plastic and cement. If anyone tries to tell you we’re using fewer materials, send him this book. With his usual skepticism and his love of data, Smil shows how our ability to make things with less material—say, soda cans that need less aluminum—makes them cheaper, which actually encourages more production. We’re using more stuff than ever.