Spontaneous duodenal fistula due to hepatic hydatid cyst

Connunication of a hepatic hydatid cyst to the duodenum appears to be extremely rare. This is the first case described in the imaging literature of hepatic echinococcosis fistulized to the duodenum studied by computed tomography.     

The effect of a common currency on the volatility of the extensive margin of trade

This paper studies the effects of the European monetary unification on the volatility of the extensive margin of trade. First, we highlight empirical novel facts about the effects of monetary unification. We build country-level measures of the extensive margin of intra-EMU exports and describe how their volatilities evolved over time. We show that the adoption of a common currency has been associated with an increase of the volatility of the extensive margin of exports for most countries, and a decrease in the volatility of the extensive margin of exports for Germany. Second, we address this question theoretically and build a two-country version of the model of Ghironi and Melitz (2005) with endogenous entry, heterogenous firms, endogenous tradability, endogenous labor supply and sticky prices. We compare the volatility of the extensive margin of trade under fixed exchange rates and in a monetary union. Monetary unification does imply an increase in the volatility of the extensive margin of trade for pre-EMU followers (such as France or the Netherlands) and a decrease in the volatility of the extensive margin of trade for the leader (Germany). This pattern is qualitatively consistent with the data but arises only if monetary policy responds moderately to output.     

On optimal regulation of price and R&D with asymmetric information

This paper deals with the optimal regulation for cost-reducing R&D and pricing in natural monopoly that is privately informed on its efficiency. We extend the work of Cantner and Kuhn (Rev Econ Des 4:191–204, 1999) and then we are able to analyse the entire effects of the interplay between agent’s efficiency and investment in R&D particularly considering the substitutability case.     

International monetary policy coordination in a new Keynesian model with NICE features

The authors provide a static two-country new Keynesian model to teach two related questions in international macroeconomics: the international transmission of unilateral monetary policy decisions and the gains coming from the coordination monetary rules. They concentrate on “normal times” and use a thoroughly graphical approach to analyze the questions at hand. In this setting monetary policy is conducted using interest rates rules and economic integration between nations does not necessarily create the case for the coordination of monetary policy. In particular, they show that the conduct of optimal national monetary policies does not make any difference with the coordination of national policies, as this creates a situation where the international monetary system operates “Near an International Cooperative Equilibrium” (NICE).     

Food Security and Agricultural Protection in South Korea

South Korea has been pursuing food self-sufficiency using high tariffs and high administrative prices in key agricultural and food markets. Using a dual approach to trade and trade restrictiveness indices, we analyze the impact of these market distortions on welfare and trade volume. Then, we compute second-best distortions, which minimize the welfare cost of meeting observed levels of self-sufficiency and production. We rationalize these second-best distortions to what could be claimed as legitimate protection under a "food security" (FS) box in World Trade Organization (WTO) negotiations. FS-box protection is sensitive to changes in the definition and the extent of the FS objectives. We show that FS via production targets and reliance on imports would be more palatable to consumers and trade partners, while preserving income transfer to the farm sector.     

Do regional trade agreements really boost trade? Evidence from agricultural products

We evaluate the impact on trade of regional trade agreements (RTAs) using a panel data approach at the detailed product level which exploits exports to third destinations and imports from third origins as benchmarks. This method is robust to both endogeneity and heterogeneity across agreements and across products, and allows differentiation between the impacts of tariff provisions and non-tariff provisions. The analysis covers agricultural and food products for 74 country pairs linked by an agreement entered into force during the period 1998–2009. Our estimate of the mean elasticity of substitution across imports at product level is slightly below four. Counterfactual simulations suggest that RTAs have increased partners’ bilateral agricultural and food exports by 30–40 % on average, with marked heterogeneity across agreements. Also, RTAs are found to increase the probability of exporting a given product to a partner country although this impact is small. Finally, we found non-tariff provisions have no measurable trade impact.     

The information content of trade credit

During 1992–2007, suppliers financed almost 10% of the total assets of US listed firms. This intensive usage of trade credit is puzzling in the light of its high (implicit) costs. By arguing that trade credit use provides valuable information to outside investors, we first derive a theoretical model that predicts a positive correlation between trade credit use and the quality of the firm’s investments. Then, using several proxies for firm’s investment quality (Z-score, return on assets, and long-run abnormal returns), we show that this prediction receives strong support from a large sample of US firms.     

Group bargaining in supply chains

Review of Economic Design - We consider a vertical supply chain in which a monopoly retailer produces a good by assembling a number of essential components each of which is owned by a monopoly....     

Cost-based access regulation and collusion in a differentiated duopoly

This paper revisits the conventional doctrine that “it is easier to collude among equals”, applied in the context of vertically related markets. In a differentiated duopoly model, we study how cost-based access price regulation may hinder the sustainability of tacit collusion.