+ wishlist Add to Cart The item has been added Author: Edward L. Deci Richard Flaste Why We Do What We Do: Understanding Self-Motivation [9780140255263] Buy More - Save More. Below are the available bulk discount rates for each individual item when you purchase a certain amount Quantity Price Savings 25 - 99 38% 100 - 249 42% 250 - 499 46% 500 - 999 48% 1000+ 50% List Price As Low as $19.00 Format: Paperback