Tonight while brushing up on a little Econ, I found this:
"It is not rational to expect to have complete information about every decision. Some ignorance is cost-effective. And individual should search(for information) only as long as the expected benefit from searching a little longer is greater than the cost of searching longer. Since the expected benefit of continuing to search once a good deal of information has been collected is likely to be low while the costs of continuing to search are likely to increase, it's sometimes rational to be partially ignorant."
It's true. Thanks for sharing Professor Kearl.