Alternative Defaultable Term Structure Models

The objective of this paper is to consider defaultable term structure models in a general setting beyond standard risk-neutral models. Using as numeraire the growth optimal portfolio, defaultable interest rate derivatives are priced under the real-world probability measure. Therefore, the existence of an equivalent risk-neutral probability measure is not required. In particular, the real-world dynamics of the instantaneous defaultable forward rates under a jump-diffusion extension of a HJM type framework are derived. Thus, by establishing a modelling framework fully under the real-world probability measure, the challenge of reconciling real-world and risk-neutral probabilities of default is deliberately avoided, which provides significant extra modelling freedom. In addition, for certain volatility specifications, finite dimensional Markovian defaultable term structure models are derived. The paper also demonstrates an alternative defaultable term structure model. It provides tractable expressions for the prices of defaultable derivatives under the assumption of independence between the discounted growth optimal portfolio and the default-adjusted short rate. These expressions are then used in a more general model as control variates for Monte Carlo simulations of credit derivatives. Nicola Bruti-Liberati: In memory of our beloved friend and colleague.     

Functional separation in Swedish broadband market: Next step of improving competition

Technological development together with liberalization policy has led to competition in the telecommunications market. Broadband has been recognized as a driving force in the social and economic development of nations, and many countries have introduced policies and/or regulatory frameworks to improve competition in broadband markets. An evolution can be seen from the 1980s until the present day through open access to local loop unbundling to several degrees of separation including functional separation. There are several countries implementing functional separation such as the UK, Italy, Sweden and, recently the EU. It has been suggested that functional separation can be an effective policy for increasing competition in broadband markets under certain circumstances. Sweden has implemented functional separation by amending the Swedish Telecommunications Act in 2008 to include mandatory functional separation as one of the powers of the PTS, the Swedish telecommunications regulator. Although TeliaSonera, the incumbent fixed line operator decided to voluntarily separate part of their business, the amendments to the law were debated with arguments similar to the debates in the EU following the new regulatory framework implemented in 2009. Against this background, this paper provides an overview of the development of functional separation in the EU and European countries such as Sweden and the UK. The paper also provides a theoretical and empirical analysis of the implementation of functional separation. The evolution of functional separation in Sweden is explained and ends with a discussion of the implementation of functional separation in the Swedish broadband market.     

Educational travel: The Overseas Internship

An important objective of educational travel programs is to teach students how to bridge cultural distance. Research remains inconclusive to what extent and under what circumstances students actually learn from educational travel experiences. This paper examines the influence of cultural distance on the perceived learning effects of the overseas internship, specifically cross-cultural competencies and management skills. It is shown that asymmetric cultural distance and psychic distance have a negative relationship with the perceived learning of management skills and interaction with locals. Students traveling to low-income countries in Sub-Saharan Africa and South Asia in particular tend to face difficulties.     

Trade Liberalization and Cartel Stability

Can reduced trade barriers promote a collusive understanding about not exporting into each others domestic markets? Reduced trade costs increase the short‐run gains from starting exporting, but can also make the long‐run punishment of such a strategy harsher. If collusion on prices is supported by a trigger strategy, a reduction in trade costs weakens competition in the sense that collusion is easier to sustain. In a corresponding model with collusion on quantities, this conclusion is reversed. The authors also discuss how results change if grim trigger strategies are replaced by stick‐and‐carrot punishments.     

Earnings Distribution and Labour Supply after a Retirement Earnings Test Reform*

Norwegian administrative data are used to evaluate the impact of a doubling of the threshold in the retirement earnings test. We find almost no impact on the extensive margin, but a positive effect on the intensive margin. This positive effect is uneven over the earnings distribution, and concentrated on workers around the threshold, increasing with exposure to the reform and leading to a decrease in earnings inequality. Individuals who remain active until retirement age respond more to the reform. Conditional on prereform earnings, we find little evidence that individual characteristics such as working histories influence the responsiveness to the reform.     

International convergence and divergence of material input structures: an industry-level perspective

This article analyses whether international material input structures have converged or diverged over time. Pooled variances for 25 industries were obtained from OECD input–output tables in constant prices for nine countries over the period 1971–1990. It is found that high-tech industries were mainly characterized by divergence of material input structures, whereas convergence was found for many low-tech, more mature industries. In line with studies on (labour) productivity growth rates, convergence of material input structures was prevalent in the 1970s, while divergence dominated in the 1980s.