  This paper provides an attempt to formalize Hayek's notion of spontaneous
order within the framework of the Arrow-Debreu economy. Our study shows that if
a competitive economy is enough fair and free, then a spontaneous economic
order shall emerge in long-run competitive equilibria so that social members
together occupy an optimal distribution of income. Despite this, the
spontaneous order might degenerate in the form of economic crises whenever an
equilibrium economy approaches the extreme competition. Remarkably, such a
theoretical framework of spontaneous order provides a bridge linking Austrian
economics and Neoclassical economics, where we shall comprehend a truth:
"Freedom promotes technological progress".
