The 4-Hour Body - An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman - Timothy Ferriss
What we found is that the actual cause of overbidding is a fear of losing, a completely new
theory from past investigations.
This is not a depressing realization. It's a useful one. Knowing that potential loss is a greater
motivator than potential reward, we can set you up for success by including a tangible risk of
public failure. Real weight-loss numbers support this. Examining random 500-person samples
from the 500,000+ users of DailyBurn, a diet and exercise tracking website, those who compete
against their peers in "challenges" lose an average of 5.9 pounds more than those who do not
compete.
There is another phenomenon that makes groups an ideal environment for change: social
comparison theory. In plain English, it means that, in a group, some people will do worse than
you ("Sarah lost only one pound--good for me!") and others will do better ("Mike's nothing
special. If he can do it, so can I.")