[saimiam]

Nowhere did I say that economics = greed is good capitalism.

Economics is fundamentally a study of how human and human society processes self interest.

It tries to find broad patterns in how we process self interest and then supports or subverts those patterns. To build on your example, capitalism reinforces self-interest while communism tries to regulate self interest. Both are economic theories.

Two countries on Dell’s supply chain not wanting to fight against each other is an example of weighing self interest and deciding that participating in a global supply chain is worth more than fighting a war.