Buy-the-dip calls looking shaky

US stocks endured one of the worst Thanksgiving weeks in recent years, on signs of greater friction between the US and China and a global flight from "risk assets".

This week, investors are awaiting signals of a détente at the Group of 20 meeting in Buenos Aires, reports from the busiest week of the year for retailers and Opec's efforts to stave off an oil crash.

The meeting between US President Donald Tr…