herd investmentn.
An investment based on what other people or institutions are investing rather than on rational analysis.
Example Citation:
"Groupthink and herd investment encouraged money-center banks, pension fund managers and credit rating agencies in the United States, Japan and elsewhere to overlook the obvious signs of the corruption, mismanagement and chicanery among their borrowers."
—Jim Hoagland, "Asia—One for the Wizards," The Washington Post
