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Commentary: Stocks are about to tumble by 7 to 10 percent

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The S&P 500 has suffered a 7 to 10 percent decline in each year since 1995. I believe this year is no different — and that, in fact, such a decline is around the corner.

First of all, the market's strength appears to be flagging. Sure, the S&P is up 9.2 percent this year, but more than half of that advance came in the first two months of 2017. It is striking to note that right now the index stands almost exactly where it found itself at the beginning of June.

This is odd, because the fundamentals have proceeded quite well. The improvement in earnings we saw in the first and second quarters, and the recent better-than-expected economic data, have all become evident after most of this year's rally had already taken place. In other words, this is yet another example of when the market moves differently than the way fundamentals tell us it "should" move.

But this distinction isn't encouraging; quite the contrary.

Beyond the stalling in the level of the S&P 500 itself, it is interesting to note that the number of stocks above their 200-day moving average has declined markedly. This tells us that the market is becoming more "narrow" in leadership.

Even worse, we're also seeing a divergence in the breadth of the market on days in which the S&P sees a big move. Last Tuesday, when the S&P 500 enjoyed a 1 percent rise, 4.5 stocks in the index advanced for each that declined. Yet two Thursdays ago, when the market slid 1.5 percent, 20 stocks fell for each that rose.

And let's not forget about the macroeconomic backdrop.

The Federal Reserve plans to begin to shrink its balance sheet, which means there will be less liquidity in the system than there has been in many years. As we have shown many times in the past, this liquidity has been the key fuel for the rally over the past eight to nine years — so the fact that it's going to be less plentiful going forward makes us quite cautious.

With monetary policy changing, we need to see fiscal policy pick up the slack. Although we do think we'll get some sort of tax package and other fiscal stimulus before next year's election, it's going to be a lot less than people were hoping for, and won't be enough to make up the difference.

In other words, the improvement in fundamentals is already behind us. Looking forward, several catalysts would seem to suggest that a drop is more likely than a rise. And for close watchers of the charts, the market's "internals" are telling us that already.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Brian Sullivan

Brian Sullivan is co-anchor of CNBC's "Power Lunch" (M-F,1PM-3PM ET), one of the network's longest running programs, as well as the host of the daily investing program "Trading Nation." He is also a frequent guest on MSNBC's "Morning Joe" and other NBC properties.

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