Here comes the melt-down.

Are stocks too expensive? Seems like they have been for a while, especially when someone in the financial press says so. For example, multiple Fed members recently commented on asset prices, using phrases like "somewhat rich," "running very much on fumes" and "close monitoring is warranted."

While that sounds like it merits worrying, valuations alone don't predict market direction. Rather, they signal where sentiment is now: more optimistic, but not close to euphoric.

The S&P 500's forward 12-month price-to-earnings ratio (which compares current stock prices to forecasted earnings) is above its post-2000 average -- but only just! It stands at 17.6 today versus the post-2000 average of 15.4.[i]

This is pretty unremarkable and not a sharp break from the recent past, either: the forward P/E first breached 17 on February 24, 2015, and has averaged 16.5 since.[ii] U.S. stocks returned 21.3% over that time -- gains that folks freaked out by "too high" valuations missed.[iii]

Exhibit 1: S&P 500 Valuations' Mild Rise

Source: FactSet, as of 6/23/2017. S&P 500 12-Month Forward P/E Ratio, 12/31/1999 - 6/23/2017.

If P/Es have been so boring recently, why all the attention? Chatty central bankers, that's why. In recent interviews, Fed members purportedly talked up "frothy asset prices" and "watching for bubble trouble." Chair Janet Yellen caused quite the stir during a Q&A at the British Academy in London:

"The so-called equilibrium rate of interest, not just in the United States but globally, looks like it may stay low for a long time. But there's a lot of uncertainty around that. Now, asset valuations are somewhat rich if you use some traditional metrics like price-earnings ratios, but I wouldn't try to comment on appropriate valuations and those ratios would depend on long-term interest rates, and, you know, of course there's uncertainty about that. So yes, by standard metrics some asset valuations look high, but there's no certainty about that." (Emphasis ours.)

You might notice[iv] Yellen repeating her uncertainty three times in as many sentences, which sounds to us like she really didn't want folks to take her comments as an authoritative declaration P/Es are too high. Yet headlines did just that:

But Yellen isn't a valuations Cassandra who is warning heedless investors of expensive markets. This was a tentative and carefully hedged observation.

The notion stocks might be a tad pricey isn't a shocking discovery either. Headlines have blared about high P/Es for years, giving markets ample opportunity to price in this worry. The Fed itself has contributed to this too: March Fed meeting minutes noted that "some participants viewed equity prices as quite high relative to standard valuation measures." Surprises move markets, not long-running and widely publicized fears amplified by prominent policymakers.

More importantly for investors, above-average valuations don't bode ill for markets because P/Es aren't predictive. At best, the forward P/E is a snapshot of sentiment, not a market timing tool.[v]

"Expensive" markets can get more expensive -- sometimes for years -- as markets keep gaining. And because markets don't mean-revert, long-term averages don't exert a gravitational pull, so stocks are never "due" to return to a certain valuation level.

Moreover, history shows Fed members citing higher P/Es isn't necessarily telling, either. One of the most prominent examples: when former Fed chair Alan Greenspan famously chalked up buoyant markets to "irrational exuberance" in December 1996. Yet that 1990s bull market continued for more than three years and U.S. stocks more than doubled. Heeding a Fed member's valuation prognosis then was costly for investors.

And for all the warnings that valuation levels portend ill for stocks, the data don't back that claim up. Consider some recent global bull market corrections -- steep, sentiment-fueled declines of 10% or more.[vi]

During 2010's April-July correction, global stocks fell 16.7% as the MSCI World forward P/E slid from 14.0 to 11.2. In 2011's steep summertime pullback, the MSCI World dropped 22.8% and the P/E went from 12.0 to 9.7, while 2012's correction saw a 13.2% slip and a P/E down to 10.6 from 12.3.

Heck, we can even go back to 2006's correction, when global stocks fell 11.5% and the P/E followed it down from 14.9 to 13.1. Our point: None of these sharp market pullbacks saw valuations above their long-term historical average (15.0 for the MSCI World since 2000). Thus, if low valuations didn't equate to calm markets, we fail to see how rising valuations foreshadow greater negative volatility.

This also holds up for bear markets -- longer, fundamentally driven declines of 20% or more. Both the MSCI World and S&P 500's forward P/E ratios hovered around their long-term historical averages right before the 2007-2009 bear market started. Why? Because the preceding bull market didn't die from euphoria.

Instead, it was caused by an unexpected wallop, driven by $2 trillion in unnecessary writedowns banks had to take and the government's haphazard handling of the fallout. Juxtapose that with the 2000-2002 bear market, when P/Es rapidly climbed to the mid-20s range right before the Tech bubble popped. Yet at the time, many investors were blinded by greed and promises of the "new economy," where clicks mattered more than cash and few noticed or cared about deteriorating fundamentals.

These examples illustrate when P/Es are most meaningful: when they're surging, few notice and those who worry are roundly mocked. This extreme disconnect between sentiment and reality can help show a bull's days are numbered. Today, we don't see such a big disconnect. Gradually rising valuations show investors are increasingly warming to an eight year-old expansion, typical in a maturing bull market. Myriad headlines, meanwhile, keep fretting about allegedly expensive stocks -- another sign euphoria is nowhere in sight.

Today, firms globally are doing well. U.S. earnings growth hit 14% in Q1, the fastest pace since 2014. Analysts expect slower but still nicely positive profit growth in Q2.

Against this backdrop, barely above-average valuations aren't very concerning. Another reason for globally minded investors to be positive: Forward eurozone P/Es are lower relative to the U.S. at 14.2,[vii] suggesting they have more room to climb. With sentiment toward the Continent still in the nascent stages of optimism -- and plenty of reasons to be optimistic about Europe in the near term -- we believe eurozone stocks are set to do well for the rest of this year.

[i] Source: FactSet, as of 6/26/2017.

[ii] Ibid. S&P 500 daily average 12-month forward P/E, 2/24/2015 - 6/28/2017.

[iii] Source: FactSet, as of 6/29/2017. S&P 500 total return, 2/24/2015 - 6/28/2017.

[iv] Partly because of that helpful emphasis we added.

[v] And don't get us started about how folks use other valuation metrics (like the strangely inflation-adjusted CAPE)!

[vi] For the rest of the data in this paragraph, source: FactSet, as of 10/3/2016. Stock returns are the MSCI World Price Returns, valuations are the MSCI World 12-month forward P/E.

[vii] Source: FactSet, as of 7/3/2017. MSCI European Economic and Monetary Union daily average 12-month forward P/E.

Fisher Investments is an independent, fee-only investment adviser serving investors globally. To learn more about Fisher Investments, please visit

The content contained in this article represents only the opinions and viewpoints of the author. It should not be regarded as personalized financial advice and no assurances are made the firm will continue to hold these views, which may change at any time based on new information, analysis or reconsideration. Investments in securities involve the risk of loss. Past performance is no guarantee of future results.
Read TheStreet's latest coverage on red-hot stocks such as Facebook ( FB - Get Report) , Tesla ( TSLA - Get Report) and Apple ( AAPL - Get Report) here.

This content is not associated with TheStreet editorial team.