What economic systems have the least in common

All of them are concerned about how to allocate the resources available to drive maximum advantage out by utilizing it. The resources are the property of the country which includes its people, land water, etc.

Likewise every government in these economies are trying to uplift the lives of the people. So this is same in every country. Although there objections to government struggles but with the growing literacy rate in countries, we see a more transparent and responsible governments. The corrupt practices of the government is going to end. So in the long run don't see this objections.

Likewise every economy wants to boost its foreign reserves by increased exports and lower imports. So trade makes us rich and every economy wants to be rich.