If there were a simple, objective answer to this, it is likely that we would have eliminated stratification by this time. Instead, people of different political ideologies have different ideas about what should be done.
Conservatives (in economic terms) tend to argue that free trade will eliminate global stratification. They say that free trade will allow all countries to participate in the global economy. They say that countries will generally become like China, moving up the global economic ladder and thus lessening stratification.
Liberals are more likely to argue for things like protectionism and foreign aid. They argue that countries should be able to build up their own domestic economies without having to compete with other countries. They also feel that rich countries should provide aid to the poorer countries.
In these ways, there are different visions of the correct approach to take to reducing stratification.