All bubbles break. All of them. Without exception.

Investors
Jeremy Grantham
Born in 1938 in Britain, Jeremy Grantham co-founded GMO, a Boston-based asset management firm, and served as its chief investment strategist. His advance warnings of every major bubble — the 2000 dot-com crash, the 2008 housing bust — earned him the title 'bubble-prediction guru.' He also launched one of the earliest index funds in the 1970s, making him a contrarian intellectual investor of rare prescience.
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Jeremy Grantham's Other Quotes
Related Quotes
The most important thing is being attentive to cycles.
-- Howard Marks
At the root of all financial bubbles is a good idea carried to excess.
-- Seth Klarman
The stock market is the story of cycles and of the human behavior that is responsible for overreactions in both directions.
-- Seth Klarman
I believe the very best money is made at the market turns. Everyone says you get killed trying to pick tops and bottoms and you make all your money by playing the trend in the middle. Well for twelve years I have been missing the meat in the middle but I have made a lot of money at tops and bottoms.
-- Paul Tudor Jones