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This paper examines how segmented asset markets can generate real and nominal effects of monetary policy. I develop a model, in which varieties of consumption bundles are purchased sequentially. Newly injected money thus disseminates slowly through the economy via second-round effects and induces a longer-lasting, non-degenerate wealth distribution. As a result, the demand elasticity differs across consumers, affecting optimal markups chosen by producers. The model predicts a short-term inflation-output trade-off, a liquidity effect, countercyclical markups, and procyclical wages and expenditure dispersion across consumers after monetary shocks. Including a modest degree of real or nominal wage rigidity yields responses that are also quantitatively in line with empirical evidence.

Abstract
This article proposes a novel mechanism by which changes in the distribution of money holdings have real aggregate effects. I develop a flexible-price model of segmented asset markets in which monetary policy influences the aggregate demand elasticity via heterogenous money holdings. Because varieties of consumption bundles are purchased sequentially, newly injected money disseminates slowly throughout the economy via second-round effects. The model predicts a short-term inflation-output trade-off, a liquidity effect, countercyclical markups, and pro-cyclical wages after monetary shocks. Among other correlations of financial variables, it also reproduces the empirical, negative relationship between changes in the money supply and markups.

This paper examines the implications of segmented assets markets for the real and nominal effects of monetary policy. I develop a model, in which varieties of consumption bundles are purchased sequentially. Newly injected money thus disseminates slowly through the economy via second-round effects and induces a non-degenerate, long-lasting heterogeneity in wealth. As a result, the effective elasticity of substitution differs across households, affecting optimal markups chosen by producers. In line with empirical evidence, the model predicts a short-term inflation-output trade-off, a liquidity effect, countercyclical markups, and procyclical profits and wages after monetary shocks.

We develop a parsimonious model of bubbles based on the assumption of imprecisely known market depth. In a speculative bubble, traders drive the price above its fundamental value in a dynamic way, driven by rational expectations about future price developments. At a previously unknown date, the bubble will endogenously burst. We provide a general condition for the possibility of bubbles depending on the risk-free rate, uncertainty about market depth, and traders' degree of leverage. This allows us to discuss several policy measures. Bubbles always reduce aggregate welfare. Among others, certain monetary policy rules, minimum leverage ratios, and a correctly implemented Tobin tax can prevent their occurrence. Implemented incorrectly, however, some of these measures backfire and facilitate bubbles.

We assess to which degree an international transfer mechanism can enhance consumption risk sharing as well as allocative efficiency and apply our results to the implicit transfers generated by a potential European unemployment benefit scheme (EUBS). Specifically, we first develop a simple model with nominal rigidities to build intuition by deriving analytical results. We then use a rich DSGE model, calibrated to the Core and the Periphery of the euro area, to quantitatively analyze the changing dynamics that a EUBS brings about. We find that a EUBS can provide risk sharing by stabilizing relative consumption as well as unemployment differentials. Following supply shocks, however, the cross-country transfer embodied in the unemployment benefits is spent to a large degree on relatively inefficiently produced goods in the receiving countries. This renders the allocation even more inefficient by opening country-specific labor wedges further, also after government-spending shocks. Yet, since this trade-off between allocative efficiency and consumption risk sharing does not exist after certain demand shocks, the welfare effects of a EUBS depend on the cause for international unemployment differentials. A EUBS that is only active after specific shocks would therefore maximize overall welfare. Even without this feature, a EUBS would raise Core's welfare in the quantitative model, leaving Periphery's welfare almost unchanged.

Abstract
We employ a dynamic stochastic general equilibrium model to investigate the transmission of the global financial crisis via the collapse of export demand (trade channel) and through losses on cross-border asset holdings (financial channel). Calibrated to German data, the model predicts the trade channel to be twice as important as the financial channel. In the United Kingdom, the latter dominates due to higher foreign-asset holdings, which, at the same time, serve as an automatic stabiliser in case of plummeting foreign demand. The financial channel leads to much longer-lasting effects. Stricter enforcement of bank capital requirements would have frontloaded the recession.

This paper provides an explanation for the observed decline of the exchange rate pass-through into import prices by modeling the effects of financial market integration on the optimal choice of the pricing currency in the context of rigid nominal goods prices. Contrary to previous literature, the interdependence of this choice with the optimal portfolio choice of internationally traded financial assets is explicitly taken into account. In particular, price setters move towards more local-currency pricing while the debt portfolio includes more foreign assets following increased financial integration. Both predictions are in line with novel empirical evidence.