The global oil benchmark flirted with the $80-a-barrel level again on Tuesday, underlining concerns that an unexpectedly strong crude rally could eventually begin to weigh on economic growth. The combination of renewed U.S. sanctions on Iran, potential sanctions on Venezuela, a rising geopolitical risk premium, strong demand and other factors have made talk of $100 crude sound less outlandish. Indeed, some analysts argue that the backdrop now leaves the market more open to potential price spikes.via