- Diplomatic meetings in Argentina this weekend could affect trade and commodity prices. The meetings also lead off this week's edition of Futures Files, our weekly commodities wrap-up. All eyes on Argentina World leaders are converging on Buenos Aires, Argentina this weekend, transfixing politicians and markets worldwide. The Group of Twenty (G20) summit represents the world's largest economies; the nations there will account for more than 80 percent of the global economy. The annual meeting is typically a headline event, but this year's summit will be especially meaningful for Americans as they watch their leaders interacting with foreign dignitaries.