World leaders gathered in Evian this week for the G7 summit, representing some of the world's biggest economies. The largest among them by far is the United States, which produces $30.8 trillion in annual output. The G7 collectively accounts for $52 trillion, nearly two-thirds more than the Brics group, at $31 trillion. In our chart of the week, it’s clear to see the G7’s dominance over the rest of the world as a formidable economic bloc.