Money is a government-issued instrument, without which the modern market cannot function. Money, without government setting interest rate, is like a bird without wings. Free market in the purest sense cannot exist without government enforcement. For example, freedom of contract is nothing more than an abstract concept without government enforcement through its court system. Practically speaking, you'll find the purer form of free market in China, Brasil, India and a few other emerging economies. If you speak to any businessman who's done transactions in these jurisdictions, the overwhelming majority of them would rather do a transaction in the US. As a matter of fact, they'd rather sell in the US at lower prices in the US. Aside from our infra structure, they have greater confidence in our legal system that spell out each party's rights and obligations. Such confidence arises precisely because UCC has been universally adopted in the US. That is government "intervention" you can call it, but it's precisely such government "intervention" that truly makes the market stable and free.
There're economists who argue otherwise, but they're on the fringe. They have an antiquated view of the market. Mainstream economists accept that there has to be government action to ensure a free market. The issue is no longer whether, but how much.