Comparisons: Capitalism vs. communism vs. socialism:

In an isolated world of plenty, socialism provides everyone with what they want and encourages creative exploration. How ever, since external forces and internal disasters exist, socialism is unsuitable as the principal basis for a long-term economy.

In an isolated, homogeneous society with a common goal and belief system, communism provides all participants with a fair share of the workload and resources. This works well for small communities, particularly for non-diversified societies.

But if we study the whole situation, one can reach on a result that it is difficult in this shrinking world to maintain cultural isolation, diversity makes communism suitable as a core economy for most modern nations.

However, to maintain its health, the power elite of a Islamic society must encourage certain societal behavior/rules/laws, that are given below,

Diversity of cultures and methods

In times of need: distribution of resources

Open competition and free trade.

In times of plenty: support for non-economically productive creativity.

Summary

I think that Islamic economic system is the most appropriate economic system and foundation for all divers' nations. This must be accompanied by open competition and diversity which I think depends upon the freedom of expression, education, free access to information, and above all is the enforcement of Islamic economic system and it is for the benefit of all.

It is important for all the nations of the world to implement the Islamic economic system in their countries in order to save their economic system. This is the only way for all the nations of the world to, and with out it no other suitable method has left for them to save their economic system.  It is the time for those who have not implemented Islamic economic system, even including Muslims countries, to implement it and at least save the system at the last moment of   further destruction.