> In addition, an economic theory can only be useful if the actions that they dictate can actually be put into practice; if nobody's going to follow what the th

> In addition, an economic theory can only be useful if the actions that they dictate can actually be put into practice; if nobody's going to follow what the theory tells you to do, then it's of little use at all. That is not a requirement for a theory to be useful. The fact that not using it has a cost is proof of its utility.