Can Aging Bull Market Regain the Blush of Youth?

By Michael Santoli

The scenario for stocks in 2013 hinges on whether an already mature bull market can find the right combination of supplements and psychology to age gracefully for another year.

In two months, this bull run will turn four years old, having more than doubled since it began on March 9, 2009, with the S&P 500 index (^GSPC) lifting off from a 13-year low of 676. The average duration of all prior bull markets since 1929 is 3.8 years, and the median just 3.6 years. The major indexes have also risen more than the average, albeit from the wreckage of a particularly devastating decline.

Aside from this simple tale of the tape, some seasoned observers are spying wrinkles on the bull. Technical market analyst Mary Ann Bartels of Bank of America Merrill Lynch views fewer and larger stocks leading the tape higher, with unimpressive momentum, as evidence of an aging advance that could culminate sometime this year. Investment firm Leuthold Group also backed off its previous optimistic stock views because of the hazards of mature uptrends.

More fundamentally, much of the benefit from soaring corporate profits and sharply lower interest rates has been realized, this fuel largely spent in propelling stocks to their current levels. Corporate profit margins are near 50-year highs and borrowing rates around half-century lows. There are plausible arguments for why both can remain benignly steady but neither is likely to provide incremental oomph for share prices.

Yet a few factors mitigate the effects of the years on this stock market phase. For one, all prior bull markets at least matched their former all-time high, which now would mean gaining at least another 10%.

Then there is the fact that this bull is uncommonly battle-tested. It has been shadowed by the constant fear that the global economic recovery was faltering, and rattled by the periodic loss of faith in sovereign finances. It has weathered a double-digit percentage decline in each of its three full calendar years, only to prove resilient (with the copious help of central banks’ free money acting as “liquid courage,” naturally).

Because of this pattern, few of the excesses that typically build up and eventually doom a rising market are apparent. The public has not gotten excited about the market and therefore hasn’t driven much speculative froth. Valuations – while not cheap compared to profits – are within roughly the normal band of historical readings, and would not impede a run to new highs should recent signs of economic momentum persist.

Stocks, too, are being flattered by the company they’re keeping. The U.S. economy, though it’s been growing for more than three years, is still operating well below its potential, with lots of slack productive capacity and idle workers. These are early-stage-recovery traits, and as such are being treated with intense post-recession medicine by a Fed that still views this as a fragile, halting expansion. While the release of minutes from the December Fed meeting showed some policy committee members preferring to end the bond-buying program later this year, the Fed will almost certainly continue to err on the side of easy money and keep rates near zero.