The S&P 500 has returned more that 20% in the last ... years with gains above 20%. That supports the Wall Street aphorism that momentum in the stock market begets more momentum. The chart implies ...

A dip into historical data shows that the stock market has responded differently under Republican and Democrat presidents.

That means the index has returned more than 20% in two consecutive calendar years, something it last did in ... momentum in the stock market begets more momentum. The chart implies the S&P 500 ...