| This Bull Market Isn't as Old as Some Seem to Think March 10, 2017
 By  Barry Ritholtz
 
 To  committed readers of the financial press, it was almost impossible to  miss the proclamations that a milestone had been passed: The bull  market, as of yesterday, was eight years old. For a sampling of examples  see  this,  this,  this,  this,  this or  this.
 
 This  formulation is wrong, since it misconstrues the definition of a bull  market. Rather than saying that the bull market is celebrating its  eighth birthday, what we really are observing is the eighth anniversary  of the bear-market lows.
 
 The age of a bull market has important  ramifications. Understanding if we are in the second, third, fourth or  eighth year of a market cycle is a pretty big deal. The age of a bull  isn't about picayune definitions; nor is it a rationalization for a  pricey stock market. Rather, this is an attempt to provide some  precision, accuracy and clarity as a counterpoint to lazy market  commentary.
 
 With that insufferable preamble out of the way, let’s  move on to a different, but intriguing question: How long was the  1982-2000 bull market?
 
 Warning: This is a trick question.
 
 The  obvious answer is 18 years -- at least that’s the answer I would give.  But as you heard throughout your high school math classes, the answer  isn't all that matters -- it's how you got to it. “Show your work” was  exhorted on every calculus exam you took. It applies here as well.
 
 My  position on market cycles is as follows: Secular bull markets -- versus  cyclical rallies and sell-offs -- begin when indexes surpass earlier  highs. Thus, in 1982, when the Dow Jones Industrial Average eclipsed  1,000 on a permanent basis, is when we mark the beginning of that epic  18-year bull market.
 
 Why is this important? Understanding how old a  bull market is may very likely affect your expectations of future  returns, your risk appetite, even your investment allocations.  Misunderstanding when a bull market began is potentially a very  expensive error to make.
 
 Charlie Munger exhorts constantly to “ Invert, always invert.” Let’s follow his advice and see what happens if we agree with the suggestion that the bull market is eight years old.
 
 If  you do that, though, you must make similar assumptions about other bull  markets of the past century. Consider what this does to the historical  examples.
 
 It means that the 1982-2000 bull market actually lasted  26 years, starting with the 1974 bear-market bottom. If you speak to  people who were working on Wall Street in the 1970s, none of them will  tell you that period felt like bull market -- because it  wasn't. But that’s the date you need to use to be consistent with those  who say this bull market is eight years old.
 
 Now, almost everyone knows that earlier bull market didn't last that long.
 
 Let’s  look at another historical example: the secular bull market that  tracked the postwar period from 1946 to 1966. How long was that bull  market? Obviously, the answer is 20 years. But if you apply the same  reasoning that leads someone to say today's bull market is eight years  old, then that rally would have lasted 34 years, perversely beginning in  1932.   Again, I don't think anyone who lived through the Great Depression would say that it coincided with a bull market.
 
 So let's be consistent. As I wrote in  February 2013,  a breakout to new highs would mark the end of the bear market, and the  beginning of a new bull market. That seems to have occurred and that is  the more appropriate start date for this bull market. In other words,  this bull market looks like it's four years old.
 
 Definitions  matter. There is a big difference between cyclical bull markets, bear  market rallies and corrections within a secular bull market.  Understanding this can make all the difference in the world.
 
 (Corrects 11th paragraph to indicate that the stock market bottomed in 1974, implying a bull run of 26 years.)There  are, of course, countervailing theories. Do we date the postwar bull  market from 1946, when the war-time mobilization ended, or from 1954,  when the earlier highs were eclipsed? People have made the case for  each.
 
 bloomberg.com
 
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