This article starts with a quote from a book titled "Altruism" and in the first paragraph notes that for (George) Soros, "if the doctrine of economic laissez- faire — a term dear to philosopher Ayn Rand — had been submitted to the rigors of scientific and empirical research, it would have been rejected a long time ago."

If the the preset economic system in the USA was "submitted to the rigors of scientific and empirical research" the assertion that it is an example of laissez-Faire capitalism is what would have to be rejected.