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.

Believers of this theory feel that even though a stock or the overall market is fully valued, speculation is warranted because there are enough fools (greater fools) to push prices further upward. See: Fully Valued; Overvalued; Speculation; Undervalued

The theory that it is possible to make money by buying overvalued securities because there will almost always be someone else (a greater fool) who is willing to purchase these security at an even higher price.