The Stock Market Has Been Ripping. Three Reasons It Can Keep Gaining.

It might seem like a head-scratcher that the stock market has surged in the past few weeks. Don’t be surprised if it continues. 

The S&P 500 has risen about 9% to 4,543 from 4,170, its lowest closing level of the year, which it hit on March 8. That comes even though the factors dragging stocks down are formidable.

The price of oil remains…