Do good workers hurt bad workers—or is it the other way around?*

I study the effect of worker heterogeneities on wages and unemployment in a directed search model. A worker's productivity in a given firm depends both on his type and on a worker–firm specific component. Firms advertise unconditional wage offers only. The resulting equilibrium is inefficient, with a too high wage premium for high‐type workers, and too few high‐type jobs. This reduces the welfare of high‐type workers. My findings contrast with the findings in the literature on labor market segmentation, where it is argued that the existence of high‐type workers forces down wages and reduces welfare for low‐type workers.     

Optimal portfolios in commodity futures markets

We develop a general approach to portfolio optimization in futures markets. Following the Heath–Jarrow–Morton (HJM) approach, we model the entire futures price curve at once as a solution of a stochastic partial differential equation. We also develop a general formalism to handle portfolios of futures contracts. In the portfolio optimization problem, the agent invests in futures contracts and a risk-free asset, and her objective is to maximize the utility from final wealth. In order to capture self-consistent futures price dynamics, we study a class of futures price curve models which admit a finite-dimensional realization. More precisely, we establish conditions under which the futures price dynamics can be realized in finite dimensions. Using the finite-dimensional realization, we derive a finite-dimensional form of the portfolio optimization problem and study its solution. We also give an economic interpretation of the coordinate process driving the finite-dimensional realization.     

The non-globalisation of modern food retailing: the case of the failed Coop Norden merger

ABSTRACT

By discussing the creation and subsequent failure of Coop Norden, set up by the Scandinavian consumer co-operatives in 2002 as a common wholesale and food retail enterprise, this article provides insights into the nature of the Scandinavian food retail sector and co-operative enterprises in an era of globalisation. The article combines recent research on the globalisation of retailing with the academic literature on the economic position and development of consumer co-operative enterprises. The article concludes that the failure of Coop Norden can be seen as the natural consequence of two inherent problems: 1. A flawed vision among co-operative managers on how globalisation would impact retailing and 2. A misalignment between Danish, Norwegian and Swedish co-operative agendas. The article is based on comprehensive studies of the internal co-operative archives in Denmark and Norway.     

Bidding strategies and takeover premiums: A review

I review recent empirical research documenting offer premiums and bidding strategies in corporate takeovers. The discussion ranges from optimal auction bidding to the choice of deal payment form and premium effects of poison pills. The evidence describes the takeover process at a detailed level, from initial premiums to bid jumps, entry of rival bidders, and toehold strategies. Cross-sectional tests illuminate whether bidders properly adjust for winner's curse, whether target stock price runups force offer price markups, and whether auctions of bankrupt firms result in fire-sale discounts. The evidence is suggestive of rational strategic bidding behavior in specific contexts.     

Time for a Nordic business history initiative?

The current state of Nordic business history is by certain estimates better than ever. Nordic business historians publish extensively in leading international journals and have a strong presence at international business history conferences. Still, in this discussion article we raise a yellow flag of warning for the future of Nordic business history. We argue that the subject field is challenged along three important dimensions: (i) lack of relevant teaching, (ii) continued reliance on commissioned history and (iii) limited recruitment. The article discusses these challenges and seeks to place them in a historical perspective. For each challenge, we develop a set of concrete proposals to address the problems identified. A common theme in our proposed solutions is to intensify Nordic collaboration, particularly through the establishment of common, externally funded Nordic research projects. To create meeting grounds for the development of such projects, The Scandinavian Society for Economic and Social History – the formal collaborative body for Nordic economic historians and the owner of Scandinavian Economic History Review – should be reinvigorated.     

Bankruptcy as an Auction Process: Lessons from Sweden

The traditional U.S. Chapter 11 bankruptcy process in which financial claims are renegotiated under court protection and the firm continues to operate under existing management has long been criticized by economists as an inefficient way of dealing with financially distressed companies. In this paper, the authors make the case for a mandatory auction bankruptcy system of the kind now used in Sweden—one that requires all companies filing for Chapter 11 to be sold in open auctions soon after the filing. After discussing the notable features of and differences between the U.S. and Swedish bankruptcy systems, the authors summarize recent research (much of it their own) on the benefits and possible drawbacks of the Swedish system. Among the most notable findings of this research, there is no evidence that mandatory bankruptcy auctions in Sweden lead to “fire‐sale” discounts in auction premiums. Moreover, the fact that three‐quarters of the Swedish companies that filed for bankruptcy survived as going concerns should allay concerns that an auction system will produce excessive liquidations. At the same time, the post‐bankruptcy operating profitability of the companies that emerge from Swedish auctions as going concerns tends to be on a par with that of their (non‐bankrupt) industry peers. Such post‐operating performance, when combined with a 75% rate of reorganization (versus liquidation), suggests that allowing auction investors—instead of the bankruptcy court—decide which companies survive and how they get capitalized and restructured has been quite effective in accomplishing the two aims of a bankruptcy system: (1) preserving intact all economically viable enterprises while (2) eliminating the excess capacity that results from prolonging the existence of companies that are never expected to earn high enough returns on capital to attract private investment. Consistent with these findings, the U.S. in recent years has seen a sharp increase in the use of auctions in Chapter 11 bankruptcies, though on a voluntary rather than a mandatory basis. Such a change reflects the growing recognition of the role of auction processes in reducing bankruptcy costs and preserving going‐concern values as U.S. capital market participants push harder for private workouts, “prepackaged” Chapter 11 filings, and auction sales in Chapter 11.     

Evaluating Social Policy by Experimental and Nonexperimental Methods

Although it is important to establish causal relationships in social policy evaluation, the effects are difficult to observe due to sample selection. To evaluate the performance of estimators designed to handle sample selection bias, we analyse data from a Norwegian rehabilitation project with a randomised experimental design. The data permit us to compare the performance of different nonexperimental estimators with the experimental results. In our case study we find that nonexperimental evaluation based on sample selection estimators with selection terms that fail to meet conventional levels of statistical significance is highly unreliable. The difference in difference estimator and propensity score matching estimators perform better in our context.
JEL classification : C 51; J 24; H 43; I 12     

Dynamic copula models for the spark spread

We propose a non-symmetric copula to model the evolution of electricity and gas prices by a bivariate non-Gaussian autoregressive process. We identify the marginal dynamics as driven by normal inverse Gaussian processes, estimating them from a series of observed UK electricity and gas spot data. We estimate the copula by modeling the difference between the empirical copula and the independent copula. We then simulate the joint process and price options written on the spark spread. We find that option prices are significantly influenced by the copula and the marginal distributions, along with the seasonality of the underlying prices.     

THE STOCHASTIC VOLATILITY MODEL OF BARNDORFF‐NIELSEN AND SHEPHARD IN COMMODITY MARKETS

We consider the non‐Gaussian stochastic volatility model of Barndorff‐Nielsen and Shephard for the exponential mean‐reversion model of Schwartz proposed for commodity spot prices. We analyze the properties of the stochastic dynamics, and show in particular that the log‐spot prices possess a stationary distribution defined as a normal variance‐mixture model. Furthermore, the stochastic volatility model allows for explicit forward prices, which may produce a hump structure inherited from the mean‐reversion of the stochastic volatility. Although the spot price dynamics has continuous paths, the forward prices will have a jump dynamics, where jumps occur according to changes in the volatility process. We compare with the popular Heston stochastic volatility dynamics, and show that the Barndorff‐Nielsen and Shephard model provides a more flexible framework in describing commodity spot prices. An empirical example on UK spot data is included.