I read an insightfularticle about decision fatigue in the NYT Sunday magazine.
The basic point of the article is that decisions of any size require energy. The more you make during a day, the more likely you will either make a crappy one or that you will go with what is recommended to you ... and in a sales situation, its always going to cost.
Insightful to the frugalistas and frugalistas-in-training, for a number of reasons.
Remember the saying "you can have anything, but you can't have everything"? Of course, it means that you have to figure out what your anythings are in the whole universe of everything ... which means setting priorities .... which means decisions. Lots of decisions.
People sometimes consider my tactic of setting a routine to be ho-hum, but it means that I don't have to re-make routine decisions and I free myself for the biggies during the day.
Every so often the question, "what is the most frugal skill one can develop?" pops up. I thought it was math estimation skills but I might make the case that preventing decision fatigue might well be it.