There is perhaps no word that captures the mood of the world today better than uncertainty. Geopolitical tensions, wars, trade disruptions, volatile energy prices, changing interest-rate expectations and shifting global alliances have made it increasingly difficult to predict what lies ahead. Businesses are cautious, investors are nervous and markets are reacting to every new development.At a recent conversation in Chicago, Jamie Dimon, Chairman and CEO of JPMorgan Chase, spoke about the extraordinary uncertainty confronting the global economy.