Five Stages of a Bubble

(1) Displacement: A displacement occurs when investors get hooked by a new paradigm, such as an innovative new technology or interest rates that are historically low. A classic example of displacement is the decline in the federal funds rate from 6.5% in May 2000, to 1% in June 2003 in US. Over this three-year period, the interest rate on 30-year fixed-rate mortgages fell by 2.5 percentage points to a historic low of 5.21%, sowing the seeds for the housing bubble.

(2) Boom: Prices rise slowly at first, following a displacement, but then gain momentum as more and more participants enter the market, setting the stage for the boom phase. During this phase, the asset in question attracts widespread media coverage. Fear of missing out on what could be a once-in-a-lifetime opportunity spurs more speculation, drawing an increasing number of participants into the fold.

(3) Euphoria: During this phase, caution is thrown to the wind, as asset prices skyrocket. The "greater fool" theory plays out everywhere. Valuations reach extreme levels during this phase. For example, at the peak of the Japanese real estate bubble in 1989, land in Tokyo sold for as much as $139,000 per square foot, or more than 350-times the value of Manhattan property. After the bubble burst, real estate lost approximately 80% of its inflated value, while stock prices declined by 70%. Similarly, at the height of the internet bubble in March 2000, the combined value of all technology stocks on the Nasdaq was higher than the GDP of most nations. During the euphoric phase, new valuation measures and metrics are touted to justify the relentless rise in asset prices.

(4) Profit Taking: By this time, the smart money – heeding the warning signs – is generally selling out positions and taking profits. But estimating the exact time when a bubble is due to collapse can be a difficult exercise and extremely hazardous to one's financial health, because, as John Maynard Keynes put it, "the markets can stay irrational longer than you can stay solvent." Note that it only takes a relatively minor event to prick a bubble, but once it is pricked, the bubble cannot "inflate" again. In August 2007, for example, French bank BNP Paribas halted withdrawals from three investment funds with substantial exposure to U.S. subprime mortgages because it could not value their holdings. While this development initially rattled financial markets, it was brushed aside over the next couple months, as global equity markets reached new highs. In retrospect, this relatively minor event was indeed a warning sign of the turbulent times to come.

(5) Panic: In the panic stage, asset prices reverse course and descend as rapidly as they had ascended. Investors and speculators, faced with margin calls and plunging values of their holdings, now want to liquidate them at any price. As supply overwhelms demand, asset prices slide sharply. One of the most vivid examples of global panic in financial markets occurred in October 2008, weeks after Lehman Brothers declared bankruptcy and Fannie Mae, Freddie Mac and AIG almost collapsed. The S&P 500 plunged almost 17% that month, its ninth-worst monthly performance. In that single month, global equity markets lost a staggering $9.3 trillion of 22% of their combined market capitalization.