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.

Gives the term household names a whole new meaning

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