Another important feature of successful market eccomomic and legal systems is that they have institutionalized policies to deal with failure and liability – for example bankruptcy statutes that remove or limit the obligation to repay debt once it becomes impossible to do so, and shifts a good part of risk to investors and creditors. Otherwise failure (the eventual outcome of virtually all business efforts if one looks at a long enough time span) allows individuals, families and larger economic associations to become burdened with unplayable debts, and raises the risk of economic initiative to the point where it stifles risk-taking and innovation.
All of that, at bottom, is based first on an enforceable, stable system of private property rights.