India and the European Union have signed a massive trade deal that will account for a quarter of the world’s GDP. This follows another deal struck by the EU with Latin American countries this month, and marks a shift in India away from economic protectionism. The World’s Carolyn Beeler learned more from Eswar Prasad, a professor of trade policy at Cornell University and author of the forthcoming book “The Doom Loop: Why the World Economic Order Is Spiraling Into Disorder.”