There's quite a bit of evidence that willpower is a limited resource [1]. Eg if you're on a diet and have to resist eating chocolate, you'll accomplish less at

There's quite a bit of evidence that willpower is a limited resource [1]. Eg if you're on a diet and have to resist eating chocolate, you'll accomplish less at work. So solutions that let you get away without having to exercise self-control are much more useful than solutions that require expending willpower. [1]: http://scholar.google.com/scholar?q=willpower+limited+resource&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ei=t4aBT9y2LeTK0AG1wfiACA&sqi=2&ved=0CBgQgQMwAA http://scholar.google.com/scholar?q=willpower+limited+resour...