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Showing posts with the label predator-prey model

More predator-prey business cycle theory

Again from this paper : "Information asymmetry among the economic players generates an incentive for non-cooperative strategies. Specifically, we assume that the producers’ control on the means of production of the companies allow them to extract rents from them at the expense of the sector of investors that do not enjoy such control (the creditors), who in turn impose limits on this “predatory activity” by subjecting the corporate leadership through creditor controls, resulting in dynamic process analogue to the classical Lotka-Volterra Predator-Prey model."

Defining a bubble

From a very interesting paper using a predator-prey model to capture the business cycle: "From a financial markets viewpoint, the implication is of course that everyone could be buying a stock that each one of the investors privately thinks is overvalued, but which nevertheless keeps soaring because the purchase decision is not made on the basis on one's individual assessment of the asset value itself but of everyone else's assessment: in short, this interpretation says that, in a financial 'bubble', an asset price would go up because everyone is buying it, and everyone would buy it because it is going up, regardless of its fundamentals." This definition seems sound to me, and contra Scott Sumner, it shows how we can have a bubble even if we cannot reliably profit from the fact that it exists: we have no idea how long people will keep buying an asset because everyone else is buying it.

Vico's two-population model of city formation

" The origin of cities , which developed from extended families which included both children and servants. We find that cities were naturally founded on two communities, the nobles who commanded and the plebeians who obeyed: for these two parts make up the entire polity or law of civil governments. I shall show that the first cities could not have arisen at all merely on the basis of simple nuclear families." -- New Science , pp. 16-17