Definitions for "Greater Fool Theory"
Belief held by one who makes a questionable investment, with the assumption that he/she will be able to sell it later to a bigger fool.
An investment notion that even when a stock is fully valued by conventional standards, there is room for upward movement because there are enough buyers to push prices farther upward purely on speculation or hype.
A belief (or hope) held by some investors, that there will always be someone willing to pay a high (perhaps too-high) a price for a property, especially during inflationary or boom times. This is the more formal name for the "there's a sucker born every minute" principle.
Keywords:  greenmail, greenshoe, option
Greenmail Greenshoe option