Dr. YUEN Wai Kee, ThomasThomasDr. YUEN Wai Kee2017-09-082017-09-0820009628719084http://hdl.handle.net/20.500.11861/443917 pagesThis paper launches a speculative bubble indicator to detect bubbles in high frequency asset price using least square method. The bubble indicator can detect the accelerating expansion phase of speculative bubbles. The bubble indicator is applied to describe the daily NASDAQ, Euro and Yen, from January 1999 to the end of February 2000. The results provide insight in three controversial issues of bubbles, the life, the size and the frequency of bubbles. The conclusion is that bubbles are essentially short-lived, small-scale and a natural phenomenon in asset markets.enWorking Paper