CNBC Daily Open: Too early to fret about tech pullback?

1. November typically sees an average gain of 1.8% for S&P 500. 2. S&P 500 lost over 1% in the first week of November. 3. Concerns over tech stock valuations due to concentration risks are rising. 4. Goldman Sachs predicts a 10-20% drawdown in equity markets ahead. 5. Possible buying opportunities arise despite earnings reassurances.