Stock market concept
The global stock market is another new feature for "Phase 2" that allows you to trade with stocks from global companies that deal with all the nations.

It was introduced as another way of making money (or loosing it, depending on your fortunes) in the game asides from the regular income by your regions.

As with all regular stock markets you can buy and sell shares whenever you want (but here without having to pay taxes), and if you're lucky you can sell at a higher price than you bought. But note that this is a pretty volatile market, so a share that looked stable for a long period may crash down to almost zero within a few turns. So if you want to make money here it's a good idea to check the stock market on a regular base.