Roughly what share of world exports and imports do the developed nations account for?

1. Developed nations have mature communication, financial, educational and distribution systems. 2. Those systems make them the major players in international trade. 3. They account for about 70 percent of the exports and imports of the world. 4. The three other figures either understate or overstate that concentration. _Source: OpenStax Introduction to Business (CC BY 4.0), Ch 3 "Competing in the Global Marketplace", section 3.1 Global Trade in the United States_