Bulletin: Brian Arthur Has Just Invented Austrian Economics
| Dick Langlois |
Surprisingly, the following passage is not from O’Driscoll and Rizzo (1985). It is the abstract of a new paper by Brian Arthur called “Complexity Economics: A Different Framework for Economic Thought.”
This paper provides a logical framework for complexity economics. Complexity economics builds from the proposition that the economy is not necessarily in equilibrium: economic agents (firms, consumers, investors) constantly change their actions and strategies in response to the outcome they mutually create. This further changes the outcome, which requires them to adjust afresh. Agents thus live in a world where their beliefs and strategies are constantly being “tested” for survival within an outcome or “ecology” these beliefs and strategies together create. Economics has largely avoided this nonequilibrium view in the past, but if we allow it, we see patterns or phenomena not visible to equilibrium analysis. These emerge probabilistically, last for some time and dissipate, and they correspond to complex structures in other fields. We also see the economy not as something given and existing but forming from a constantly developing set of technological innovations, institutions, and arrangements that draw forth further innovations, institutions and arrangements. Complexity economics sees the economy as in motion, perpetually “computing” itself— perpetually constructing itself anew. Where equilibrium economics emphasizes order, determinacy, deduction, and stasis, complexity economics emphasizes contingency, indeterminacy, sense-making, and openness to change. In this framework time, in the sense of real historical time, becomes important, and a solution is no longer necessarily a set of mathematical conditions but a pattern, a set of emergent phenomena, a set of changes that may induce further changes, a set of existing entities creating novel entities. Equilibrium economics is a special case of nonequilibrium and hence complexity economics, therefore complexity economics is economics done in a more general way. It shows us an economy perpetually inventing itself, creating novel structures and possibilities for exploitation, and perpetually open to response.
Arthur does acknowledge that people like Marshall, Veblen, Schumpeter, Hayek, and Shackle have had much to say about exactly these issues. “But the thinking was largely history-specific, particular, case-based, and intuitive—in a word, literary—and therefore held to be beyond the reach of generalizable reasoning, so in time what had come to be called political economy became pushed to the side, acknowledged as practical and useful but not always respected.” So what Arthur has in mind is a mathematical theory, no doubt a form of what Roger Koppl – who is cited obscurely in a footnote – calls BRACE Economics.