What roles in the global economy would China, the U.S. and India play by 2050?

These 3 economies would represent the largest chunk of global economy.

• USA keeps globalization and free markets open for everyone acting like world police.
• China will create the next global financial crisis but will still be a major force.
• India will exceed china if they play it right when china crisis happens.

In other words the world economy will be stable if these three keep their global economic interests and partners stable.

The world politics is already revolving around these economies.

Below are several sources predictions.