Frankly we have no idea what drives markets, certainly not on a day-by-day basis. If you are a newspaper, you have to fill space and provide supposedly enlightened analysis. This take is probably as good as any:
By JACK HEALY and KEITH BRADSHER 46 minutes ago
Shares rose ahead of the start of earnings season, and the value of the dollar skidded as investors fretted over a report that crude oil could one day be priced in other currencies.