An investment theory stating that even when a stock is fully valued by conventional standards, room for upward movement is present because there are enough fools to push prices further upward purely on speculation and/or hype.
GREATER FOOL THEORY
Meaning of GREATER FOOL THEORY in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012