Sin City? Why is the Divorce Rate Higher in Urban Areas?*

Divorce rates are higher in cities. Based on Danish register data, this paper shows that of the marriages formed in the city, those couples who remain in the city have a 23% higher divorce rate than those who move out. In this paper, we test whether this observation is due to sorting of more stable marriages into rural areas or if there exists a causal effect of living in urban areas on marriage instability. Our identification strategy supplements the timing‐of‐events approach with an instrumental variable. Our findings suggest that the effect of living in an urban area on the divorce risks drops substantially and loses statistical significance once we address sorting.     

Performance Management in Insurance Firms by Using Transfer Pricing

In this article, we analyze the asset and liability management and market risk systems of insurance companies. We discuss that the current system is not goal congruent and does not satisfy necessary conditions for effective control. It follows that managers are unable to run their business effectively. We develop a transfer pricing system that allows the clear separation of underwriting and investment activities, both on the risk and return aspects. It creates the appropriate incentive schemes. We illustrate this system with an example indicating the differences in incentives between the traditional embedded value measures and the proposed funds transfer pricing system.     

Illinois Walls: how barring indirect purchaser suits facilitates collusion

In its landmark ruling in Illinois Brick Co. v. Illinois in 1977, the U.S. Supreme Court restricted standing to sue for recovery of antitrust damages to direct purchasers. However, antitrust damages are typically (in part) passed on to intermediaries lower in the chain of production and ultimately to consumers. We show that the Illinois Brick rule facilitates collusion. It allows an upstream cartel to shield itself from private damage claims by forwarding a share of cartel profits to its direct purchasers. These benefits dissuade the direct purchasers from exercising their exclusive right to sue for private damages. The cartel can achieve this by rationing inputs at low prices. Several U.S. antitrust cases show symptoms of “Illinois Walls.”     

A disequilibrium analysis of the labour market: Review and comments

Summary The article has been divided into two main parts. The first consists of a review and an evaluation of Lenderink and Siebrand's analytical and empirical approaches to the short-run phenomena on the Dutch labour market during the period 1952–1970. The main implications are explicitly stated and show how the authors have integrated the relevant results of equilibrium and disequilibrium analysis. It appears that the general analytical approach of Lenderink and Siebrand certainly is very promising. From the comments in the second part it becomes clear that the authors' main empirical results should be rejected. Some new data are produced to be compared with the originally presented data. They provide the basis for emphasizing that the original analysis does not satisfy some theoretical and empirical consistency conditions. Therefore, suggestions for revision of some aspects of Lenderink and Siebrand's study are recommended. This paper consists of a review of and comments uponA Disequilibrium Analysis of the Labour Market (Lenderink and Siebrand, 1976).     

A note on the length,measured along fixed orientations,of a path connecting any two points relative to their straight line distance

Let D be an invertible matrix and L₁ (x) denote the well‐known 1‐norm of x∈Rⁿ. In this note we analyse the kth moment of the ratio L₁ (D^?1z) and its asymptotics in special cases, where z is uniformly distributed over the unit hypersphere. Conceptually, L₁ (D^?1z) can be seen as the (weighted) length, measured along fixed orientations, of a path connecting any two points relative to their straight line distance.     

Is transcatheter aortic valve implantation (TAVI) a cost-effective treatment in patients who are ineligible for surgical aortic valve replacement? A systematic review of economic evaluations

Objectives:

Health Technology Assessment (HTA) agencies often undertake a review of economic evaluations of an intervention during an appraisal in order to identify published estimates of cost-effectiveness, to elicit comparisons with the results of their own model, and to support local reimbursement decision-making. The aim of this research is to determine whether Transcatheter Aortic Valve Implantation (TAVI) compared to medical management (MM) is cost-effective in patients ineligible for surgical aortic valve replacement (SAVR), across different jurisdictions and country-specific evaluations.

Methods:

A systematic review of the literature from 2007–2012 was performed in the MEDLINE, MEDLINE in-process, EMBASE, and UK NHS EED databases according to standard methods, supplemented by a search of published HTA models. All identified publications were reviewed independently by two health economists. The British Medical Journal (BMJ) 35-point checklist for economic evaluations was used to assess study reporting. To compare results, incremental cost effectiveness ratios (ICERs) were converted to 2012 dollars using purchasing power parity (PPP) techniques.

Results:

Six studies were identified representing five reimbursement jurisdictions (England/Wales, Scotland, the US, Canada, and Belgium) and different modeling techniques. The identified economic evaluations represent different willingness-to-pay thresholds, discount rates, medical costs, and healthcare systems. In addition, the model structures, time horizons, and cycle lengths varied. When adjusting for differences in currencies, the ICERs ranged from $27K–$65K per QALY gained.

Conclusions:

Despite notable differences in modeling approach, under the thresholds defined by using either the local threshold value or that recommended by the World Health Organization (WHO) threshold value, each study showed that TAVI was likely to be a cost-effective intervention for patients ineligible for SAVR.     

The Nature of Unemployment among Young Men in Urban Ethiopia

This paper investigates the nature of unemployment among young men in urban Ethiopia and finds that it is concentrated among relatively well‐educated first‐time job seekers who aspire to a public sector job and spend on average close to four years in unemployment. This is consistent with a segmented labor market model where youngsters queue in unemployment for a good job, as confirmed by an empirical test of the theoretical prediction. We observe a negative (causal) relationship between household welfare and both the incidence and duration of unemployment, indicating that unemployment is concentrated among the relatively worse off urban households, which from a national perspective represent the middle classes, and find suggestive evidence that part of this effect is due to malnutrition during childhood. Job search through social networks is only effective after one has become unemployed, suggesting that networks provide insurance only after exposure to the risk.