Japan Bear MarketStarting in the late 1980s, over a 14-year period, Japanese stocks declined 8.2 percent a year. This decline was driven by a complete collapse of both earnings – which declined 5.3 percent a year – and P/Es, which declined 3 percent a year. Japanese stocks were in a bear market because stocks were expensive, and earnings declined over a long period of time. In bear markets both P/Es and earnings decline.
The P/E journey from one extreme to the other is completely responsible for sideways and bull markets: P/E ascent from low to high causes bull markets, and P/E descent from high to low is responsible for the roller-coaster ride of sideways markets.
Bear markets happened when you had two conditions in place, a high starting P/E and prolonged economic distress; together they are a lethal combination. High P/Es reflect high investor expectations for the economy. Economic blues such as runaway inflation, severe deflation, declining or stagnating earnings, or a combination of these things sour these high expectations. Instead of an above-average economy, investors wake up to an economy that is below average. Presto, a bear market has started.
Let's examine the only secular bear market in the twentieth century in the United States: the period of the Great Depression. P/Es declined from 19 to 9, at a rate of about 12.5 percent a year, and earnings growth was not there to soften the blow, since earnings declined 28.1 percent a year. Thus stock prices declined by 37.5 percent a year!
