Most likely you'd basically have people work what they can with an extremely strong ghetto building.

1/7 of the people will be Chinese, 1/7 will be Indian.

Every city will have thousands of them who will find together.

The Northern and Western Europeans and the North Americans would likely also be a huge cluster as they'd make for another 1/7 and should be able to communicate quite well in English.

Aviability of common language will be a massive advantage. Many Indians might work together with the Europeans and Americans essentially.

The biggest thing will be, where will people want to go. If you are from a very poor region and you wake up in a rich region, will you be ready to leave. Who will make you leave? There will likely be fewer of the people from that region there than from poor regions.

Due to the complete breakdown of governments you might have completely new countries forming and a shuffling of where wealth is concentrated.