"In a rational market, we should see big price cuts this fall, especially as the last of the old models go on sale. Of course, that's in a rational market. Let me know if you ever find one." So ended a wsj article on e readers. Perhaps the concept applies to more than what are traditionally called markets and to virtually every human endeavor. Quite simply it is irrational to think that just because we can act rationally we will, or can for more than a moment. see my question below, why do people vote Publican.