Smart & Rational or Stupid and Irrational?

Is Capitalism Making Us Stupid? Joseph Heath says yes! "It isn't stupidity that causes commercialism, but rather commercialism that causes stupidity."

And as Alex Tabarrok puts it:

"Our limited ability to concentrate is being sapped by mind-viruses that under the pressure of profit maximization are rapidly becoming more and more effective."

This sounds right to me. Is that reason at work? Or intuition? Or a combo of both? Am I being smart and rational, or stupid and irrational? Sometimes it's hard to tell. Who to blame?