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Non-technical summaryIn a number of both emerging and advanced economies foreign currency loans (FCL) have become highly popular since the early 2000s. In the European Union this is the case for i.a. Bulgaria, Hungary, Romania, Poland and even Austria. As far as the former three countries are concerned, the FCLs in 2013 accounted for approximately 60% of loans to the non-banking sector. This number was a little lower in Poland (close to 30%) and in Austria (slightly below 20%). In the mortgage segment the share was even higher. While foreign currency loans offer some benefits to borrowers (lower interest rates and possibly longer maturities), they constitute an important source of systemic risk in the economy. In countries with a high share of FCLs, deep exchange rate depreciation generates a surge in servicing costs expressed in domestic currency, which may induce mass defaults and systemic banking crises. Additionally, FCLs may substantially affect the monetary transmission mechanism. In particular, as evidenced by empirical research, they weaken the impact of domestic interest rates on the economy since borrowers with access to FCLs are less sensitive to the movements of the domestic interest rate. Moreover, understanding the relationship between FCLs and regulatory instruments becomes extremely important given the recently growing interest in macroprudential supervision. In contrast to monetary policy, there is no empirical evidence on the impact of FCLs on the effectiveness of regulatory or macroprudential policies. The recent decisions of policymakers in several countries to restrict foreign currency lending confirms that its presence is considered important and, given only scarce empirical and no structural evidence, requires further research.In this paper we analyze the impact of FCLs through the lense of a dynamic stochastic general equilibrium (DSGE) model. While doing it we build on the theoretical literature on financial frictions as well as the empirical literature on the links between FCLs and macroeconomic policy. Our paper offers a quantitative perspective which is based on economic theory. More specifically, we design a microfounded small open economy model in which consumers have access to both domestic and foreign currency mortgage loans and use it to analyze the impact of FCLs on the working of monetary and macroprudential policies. While studying the effects of macroprudential policy, we focus not only on t...