JEL classification: C32 E31 F32 011Keywords: Commodity producers Commodity prices Natural resource curse Non-stationary panel Real exchange rates a b s t r a c t Commodity price booms, as those recorded in the last decade, may have a significant economic impact in small, commodity exporting, developing countries. Whether the impact on output is positive or negative is still unclear. It depends on various factors, notably on the impact that commodity prices can have on the real exchange rate of the commodity exporting countries. Two recent papers show that the real exchange rate appreciates when commodity prices increase. Our analysis produces new estimates of this relationship by focusing on a large sample of developing countries which are specialized in the export of one leading commodity. By using non-stationary panel techniques robust to cross-sectional dependence, we find that the price of the dominant commodity has a significant long-run impact on the real exchange rate when the exports of the leading commodity have a share of at least 20 percent in the country's total exports of merchandises. Our results also show that the larger this share, the larger the size of the impact.

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In this paper, we propose a search and matching model with nominal stickinessà la Calvo in the wage bargaining. We analyse the properties of the model, first, in the context of a typical real business cycle model driven by stochastic productivity shocks and second, in a fully specified monetary DSGE model with various real and nominal rigidities and multiple shocks. The model generates realistic statistics for the important labor market variables.