What will happen to the future development of the global economy?

1. American financial crisis: The American financial crisis in 28 triggered the deterioration of the global economy, but there are still many unsolved mysteries.

2. International oil price: Due to the complexity of the international oil market, many countries cannot control the fluctuation of oil price.

3. Global climate change: Global climate change is a complex problem, and many countries cannot solve it.

4. global economic inequality: global economic inequality is a persistent problem, and many countries cannot solve it.

5. Global financial system: The global financial system is a complex system, and many countries can't control it.