Goldman Sachs says crude could spike by $20 on Iran oil shock
It is estimated that "if you were to see a sustained 1 million barrels per day drop in Iranian production, that you would see a peak boost to oil prices next year of around $20 per barrel," Daan Struyven, Goldman Sachs' co-head of global commodities research, told CNBC's "Squawk Box Asia" on Friday.