By Frédéric Lambert, Andrea Pescatori and Frederik Toscani
Labor market informality is a pervasive feature of most developing economies. Motivated by the empirical regularity that the labor informality rate falls with GDP per capita, both at business cycle frequency and in a cross-section of countries, and that the Okun’s coefficient falls with the level of labor informality, we build a small open-economy dynamic stochastic general equilibrium model with two sectors, formal and informal, which can replicate these key stylized facts. The model is calibrated to Colombia. The results show that labor market and tax reforms play an important role in changing the informality rate but also caution against over-optimism – with low GDP per capita, informality will always be relatively high as there is insufficient demand for formal goods. Quantitatively we find that higher productivity in the formal sector is key in explaining the difference between Colombia and countries with significantly lower informality. We use the model to study how labor informality and labor market frictions mediate the cyclical response of the economy to shocks, including commodity price shocks which are particularly relevant in Latin America. Informality is shown to play an important role as a shock absorber with the informal-formal margin limiting movements in the employed-unemployed margin.
Studying informal economies is tricky business because there is poor data, pretty much by definition. But Dynamic General Equilibrium models come in handy here, as they can work with limited data (no time series required) or even absent data (best guesses can fill in). Finally they allow to work through scenarios that have not (yet) been observed thanks to internal consistency. This paper is a nice example of this. It shows that informality is not only an issue of a weak state but also of low income. Also, informality has some benefits.