Research Topics

A Stock-Flow Consistent Framework for Mexico

This working paper empirically and theoretically analyzes the exchange rate’s role in Mexico’s development for the period 2004–19. We test the hypothesis of the re(emergence) of the balance sheet effect due to an increase in external debt in the nonfinancial corporate sector; higher foreign debt would affect private investment after episodes of real currency depreciation, in the spirit of the literature put forward by Gertler, Gilchrist, and Natalucci (2007) and Céspedes, Chang, and Velasco (2004). We build a stock-flow consistent (SFC) model, following the OPENFLEX model proposed in Godley and Lavoie (2006), to explore the balance sheet implications from a theoretical perspective. We simulate the 2014 fall in the Mexican peso generated by the drop in oil prices to replicate stylized facts for Mexico for the period under investigation. The scenario analysis points to a hysteresis effect of the real exchange rate (RER) depreciation on investment flows. That is, firms’ investment ratio does not completely recover from negative shocks in the currency.

Graph Theory and Macroeconomic Regimes in Stock-flow Consistent Modeling

Standard presentations of stock-flow consistent modeling use specific Post Keynesian closures, even though a given stock-flow accounting structure supports various different economic dynamics. In this paper we separate the dynamic closure from the accounting constraints and cast the latter in the language of graph theory. The graph formulation provides (1) a representation of an economy as a collection of cash flows on a network and (2) a collection of algebraic techniques to identify independent versus dependent cash-flow variables and solve the accounting constraints. The separation into independent and dependent variables is not unique, and we argue that each such separation can be interpreted as an institutional structure or policy regime. Questions about macroeconomic regime change can thus be addressed within this framework.

We illustrate the graph tools through application of the simple stock-flow consistent model, or “SIM model,” found in Godley and Lavoie (2007). In this model there are eight different possible dynamic closures of the same underlying accounting structure. We classify the possible closures and discuss three of them in detail: the “standard” Godley–Lavoie closure, where government spending is the key policy lever; an “austerity” regime, where government spending adjusts to taxes that depend on private sector decisions; and a “colonial” regime, which is driven by taxation.