Oil fizzles on crude build, Wall St ends lower

"In some ways I don't know if the Amazon effect is much different from what we've seen with Wal-Mart or Microsoft," said Jim Paulsen, chief investment strategist at The Leuthold Group in Minneapolis

The pan-European FTSEurofirst 300 index .FTEU3 slipped 0.3 percent following five days of gains, after weak reports from German utility E.ON and Danish biotechnology company Novozymes.