U.S. stocks declined for a second straight day, and the futures market was marginally down before the opening bell in New York this morning. Yet even if the S&P 500 notches a third straight day of declines today, traders think it will eventually swing higher. This is despite a feeling among analysts that equity valuations are historically high and the market is being driven by a handful of tech companies. The S&P 500 sank for a second straight day yesterday, but no one’s complaining—it is still up nearl ...