Thank you for looking. We sell popular books. Immediate purchase OK, please feel free to ask any questions. ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ Great Mental Models by Shane Parrish and Rhiannon Beaubien, published by Sunmark Publishing. Learn the "thinking methods" of intellectual giants in one book, at once, and all at once. Used book. Learn the thinking methods of intellectual giants and derive optimal solutions in all situations. Acquire "Great Mental Models" and develop a mind that can think deeply, correctly, and from multiple perspectives! The item has light signs of use but no writing, and the content is clean. We will ship in waterproof packaging via Yu-Mail, Yu-Packet Post, or Letter Pack. For items with tracking numbers, we will provide the tracking number. Thank you for your consideration. ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊