Investors look on the bright side: Are they wearing blinders?

Stocks have gone more than 400 days without a 10% drop on their way to all-time highs, and the global economy looks poised to accelerate in 2014.  So it makes all the sense in the world that investors are more upbeat than they’ve been in years, doesn’t it?

Related: This bull market is not over, says Jeremy Siegel

A Bloomberg survey of investors shows 59% believe the global economy is improving, while more than half name stocks as their favorite asset class for 2014 even after hefty gains in 2013. As the World Economic Forum gets underway in Davos, Switzerland, the dominant emerging themes are wealth inequality and how better to distribute the world’s abundance rather than a preoccupation with systemic risks or economic crises of prior years.

IMPROVING ECONOMIES

This fits with the general tenor of investor mood as the year gets underway. In most measurable and observable ways, the U.S. economy has picked up some pace and is tracking toward a 3% real growth rate for this year. The Federal Reserve’s recession probability index is sitting near zero.

Overseas, Europe has nosed out of recession and Japan’s go-for-broke stimulus efforts have powered an export and consumer revival.  Emerging markets have slowed and are undergoing a fitful adjustment to slightly tighter Federal Reserve policy, yet the crowd sees these economies continuing to expand this year.

This comfortable consensus that economic bullets have been dodged and policy risks defused is translating into a broadly optimistic take on financial markets. Surveys of professional investment advisors in the U.S. by Investors Intelligence show multi-decade highs in the ratio of professed bulls on stocks versus bears.

The breakdown of trading in stock options lately shows far more speculative upside bets than fearful hedging. Meantime, corporate insiders have been selling their company shares at a searing pace this year, cashing in on the surge in prices in a new tax year.

Related: The great stock valuation debate: Blodget vs. Brown

These are at least causes for cautious monitoring, even as the indisputable uptrend in stocks and other risky assets such as corporate debt appears sturdy.

In weighing such hints of the market’s mood, it’s worth asking how logical, normal optimism can be distinguished from the sort of risk-oblivious overconfidence that often leaves the market susceptible to rude shocks.

READING MARKET SENTIMENT

As Yahoo Finance’s Aaron Task and I discuss in the attached video, the game of reading sentiment cues is a tricky one to play -- and can, itself, become “too popular.” There’s a hall-of-mirrors aspect to the market conversation in which “everyone” seems to be saying that “everyone else” is too much one thing or another.