As an old boss of mine used to quip: consider the source. Source considered.
More to the point, though. To be a system, something has to be created and controlled from above. Capitalism, on the other hand, is what emerges when people are given the liberty to contract with whom and how they see fit. In other words, capitalism is not something that is created nor imposed, as folks like Naomi Kline and her ilk may feel. Capitalism is that thing we see when we give people economic freedom. It is, therefore, not a system.
Communism and socialism, on the other hand, are things that must be imposed from above. They involve commanding and controlling the ownership of resources and output and, therefore, involve imposition by government bureaucrats. Both involve forcibly taking from some to give to others. In short, both communism and socialism are systems, systems that have failed miserably to improve human society.
Oh, and to respond to Mr. Ahmadinejad: I do not think the economy is "on the verge of collapse." But if it were, it's not because people were given the liberty to contract. It's because folks in high places thought they could tinker with things in order to make things better.