The release of The Undoing Project: A Friendship that Changed the World by Michael Lewis unleashed a wave of pre-order demand and propelled the book to the top of our list. Tools of Titans: The Tactics Routines and Habits of Billionaires Icons and World-Class Performers by Tim Ferriss followed a somewhat similar trajectory while Atlas Obscura: An Explorer’s Guide to the World’s Hidden Wonders by Joshua Foer, Dylan Thuras and Ella Morton stayed near the top of our monthly list.

For more book ideas you can check out our latest post compiling our many book links as well as last month’s best-selling list. We present sales two ways: the first is by unit sales and the second way is by revenue which can be notably different. Here are the books (combined print, Kindle* and Audible.com) that Abnormal Returns readers purchased at Amazon during December 2016:

The Top 10 (by Unit Sales)

1. The Undoing Project: A Friendship that Changed the World by Michael Lewis
2. Atlas Obscura: An Explorer’s Guide to the World’s Hidden Wonders by Joshua Foer, Dylan Thuras and Ella Morton
3. Tools of Titans: The Tactics Routines and Habits of Billionaires Icons and World-Class Performers by Tim Ferriss
4. The Ultimate Retirement and Estate Plan for Your Million-Dollar IRA by James Lange
5. The Intelligent Investor (Revised Edition) by Benjamin Graham and Jason Zweig
6. The Obstacle Is the Way: The Timeless Art of Turning Trials into Triumph by Ryan Holiday
7. The Wright Brothers by David McCullough
8. Algorithms to Live By: The Computer Science of Human Decisions by Brian Christian and Tom Griffiths
9. Eccentric Orbits: The Iridium Story – How a Single Man Saved the World’s Largest Satellite Constellation From Fiery Destruction by John Bloom
10. Hillbilly Elegy: A Memoir of a Family and Culture in Crisis by J.D. Vance
11. The Daily Show (The Book): An Oral History as Told by Jon Stewart the Correspondents Staff and Guests by Chris Smith

The Top 10 (by Revenue)

1. The Undoing Project: A Friendship that Changed the World by Michael Lewis
2. Atlas Obscura: An Explorer’s Guide to the World’s Hidden Wonders by Joshua Foer, Dylan Thuras and Ella Morton
3. Tools of Titans: The Tactics Routines and Habits of Billionaires Icons and World-Class Performers by Tim Ferriss
4. The Obstacle Is the Way: The Timeless Art of Turning Trials into Triumph by Ryan Holiday
5. Venture Deals: Be Smarter Than Your Lawyer and Venture Capitalist by Brad Feld and Jason Mendelson
6. The Intelligent Investor (Revised Edition) by Benjamin Graham and Jason Zweig
7. The Ultimate Retirement and Estate Plan for Your Million-Dollar IRA by James Lange
8. Hillbilly Elegy: A Memoir of a Family and Culture in Crisis by J.D. Vance
9. Eccentric Orbits: The Iridium Story – How a Single Man Saved the World’s Largest Satellite Constellation From Fiery Destruction by John Bloom
10. Quantitative Momentum: A Practitioner’s Guide to Building a Momentum-Based Stock Selection System by Wes Gray and Jack Vogel

Thanks again to everyone who purchased a copy of my book or any other book (or item) during the month. Mid-month look for our monthly post summing up all of our book-related links as well.