Spheres of influence were not spheres per se, but included everyone accepting their "world view" from some particular gang of politicians.
Marxism- From each according to their ability and to each according to their needs. Also the assumptions that everyone is honest, has nothing but good intentions for others, and is sane. Quite a circus!
Socialism- Like everyone in town using the same power station, and subjected to wage controls. Sometimes Socialism is a good thing, and sometimes it is not. The Nazis were the National Socialist Party.
Capitalism- Free enterprise used to generate the maximum of wealth for the country, by the incentive rewards of private effort. An aggressive system, which will cut out many on the bottom of society, and therefore to be legal for a culture to use Capitalism, a safety net is required such as food stamps.
If the only crop which will grow well in Afghanistan, poppies, were to be encouraged and bought up by legit medical businesses worldwide, the trickle-down of having big money in the country would create small high-tech businesses which would bootstrap their entire economy into the modern world, leaving the Taliban etc. stomping the ground in feeble protest.