What Can We Expect From the Free Market?
All that the free market guarantees is that individuals may pursue their own values. To the extent that the market is not free, some individuals are able to pursue their values at the expense of others.
The free market is essentially an individualist utilitarian environment in which one maximizes utility. This environment is different from that of classical utilitarianism in that it is not political. Policies are not set and imposed on populations through some fantastic calculation or estimate of costs and benefits, but are lived by market participants with profit and loss being the sole arbiter of success and failure.
In such an environment, experiments are welcome and the failures affect only the participants - not society at large. It is unfortunate that Karl Popper, if Bryan Magee can be taken at his word, believed that the best society was one in which problems could be solved most rapidly through experimentation and falsification of wrong theories, but never fully embraced the free market as the appropriate avenue to do that.