5 companies now make up 20% of the S&P 500. Here's why Goldman Sachs says that's a bad signal for future market returns. (MSFT, AAPL, AMZN, GOOGL, FB) | Markets Insider

Breadth of the stock market is an indicator that measures how many stocks are advancing relative to those that are declining. When a market has narrow breadth, it means a relatively small group of stocks are driving the upside in the market, while the majority of stocks are declining.Meet the 20-year-old day-trading phenom who's turned $20,000 into more than $1 million. He details his precise strategy — and shares how he made $11,400 in 2 minutes.

Goldman warned that sharp declines in market breadth have often signaled large market drawdowns in the past. How long can investors expect this extreme narrow market breadth and mega-cap concentration to last? Goldman noted that while the median episodes of narrow market breadth lasted three months, the longest period was 27 months, from 1998 to 2000.

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