The Heterogeneity of Self-Employment: The Example of Asians in the United States

Self-employment rates differ widely across industries and across racial and ethnic categories. The heterogeneity of self-employment is most pronounced among Asians working in the U.S. The self-employment rate of Koreans is almost eight times greater than the self-employment rate of Laotians. This paper examines the pattern of self-employment across more narrowly defined classifications of Asians and industries to illustrate the heterogeneity of self-employment, and discusses the implications of this heterogeneity.     

Optimal allotment policy in central bank open market operations1

This article derives a central bank's optimal liquidity supply towards a money market with an unrestricted lending facility. We show that when the effect of liquidity on market rates is not too small, and the monetary authority is concerned with both interest rates and liquidity conditions, then the optimal allotment policy may entail a ‘discontinuous’ reaction to initial conditions. In particular, the model predicts a threshold level of liquidity below which the central bank will not bail out the banking system. An estimation of the liquidity effect for the euro area suggests that the discontinuity might have contributed to the Eurosystem's tight response to occurrences of underbidding during the period June 2000 through March 2004.     

Cost-minimization analysis of sublingual immunotherapy versus subcutaneous immunotherapy for house dust mite respiratory allergic disease in Denmark

Objectives Currently, patients with persistent moderate-to-severe house dust mite (HDM) allergic rhinitis despite use of symptom-relieving medication can be offered subcutaneously administered allergy immunotherapy (SQ SCIT; Alutard SQ) as standard care of treatment in Denmark. Recently, a HDM sublingually administered allergy immunotherapy tablet (SQ SLIT-tablet; ACARIZAX) has been developed for at-home treatment. The purpose of this analysis is to compare the costs related to treatment and administration of SQ SLIT-tablet and SQ SCIT.

Methods Assuming equal efficacy between ther SQ SLIT-tablet and SQ SCIT, the cost-minimization analysis was the most appropriate for the comparison. According to guidelines and Summary of Product Characteristics, the treatment duration of SQ SLIT-tablet is 3 years and 3–5 years for SQ SCIT. The courses of treatment vary among patients and, therefore, the costs of treatment have been calculated for an average patient with HDM respiratory allergic disease (RAD) receiving either SQ SLIT-tablet or SQ SCIT. All costs associated with allergy immunotherapy were collected, i.e., cost of medication, administration and treatment setting, and discounted according to Danish guidelines. Comprehensive univariate sensitivity analyses were carried out.

Results The treatment costs for an average patient with HDM RAD are €3094 for SQ SLIT-tablet and €3799 for SQ SCIT; however, when adding indirect costs to the calculations the total costs of the treatments are €3697 and €6717 for SQ SLIT-tablet and SQ SCIT, respectively. Therefore, if 2500 patients with HDM RAD were treated with SQ SLIT-tablet instead of SQ SCIT, it would elicit a saving to the healthcare system of ～€1.8 million. The conclusion was robust to any changes in the sensitivity analysis.

Conclusion With regards to the cost of treating Danish patients with HDM RAD, it is clearly cost-saving to treat patients with SQ SLIT-tablet compared to SQ SCIT.     

Transport appraisal and Monte Carlo simulation by use of the CBA-DK model

This paper presents the Danish CBA-DK software model for assessment of transport infrastructure projects. The assessment model is based on both a deterministic calculation following the cost-benefit analysis (CBA) methodology in a Danish manual from the Ministry of Transport and on a stochastic calculation, where risk analysis is carried out using Monte Carlo simulation. Special emphasis has been placed on the separation between inherent randomness in the modeling system and lack of knowledge. These two concepts have been defined in terms of variability (ontological uncertainty) and uncertainty (epistemic uncertainty). After a short introduction to deterministic calculation resulting in some evaluation criteria a more comprehensive evaluation of the stochastic calculation is made. Especially, the risk analysis part of CBA-DK, with considerations about which probability distributions should be used, is explained. Furthermore, comprehensive assessments based on the set of distributions are made and implemented by use of a Danish case example. Finally, conclusions and a perspective are presented.     

An investigation into the effects of ethnicity and immigration on self-employment

This paper examines self-employment across industries and states in the U.S. It attempts to determine whether self-employment is due more to pull or push factors and whether one or the other model fits some industries better or fits some states better. The 1990 Public Use Microdata Samples from the U.S. Census Bureau are used in the empirical analysis. It is found that self-employment rates differ considerably across ethnic groups, and that the rate of self-employment tends to be higher for immigrants. This paper also finds that increasing urbanization tends to reduce self-employment rates while the shift from manufacturing to service industries tends to increase self-employment rates.     

Endogenous Comparative Advantages in Developing Economies

This paper focusses on endogenous comparative advantages in developing countries, in particular on labour reallocation from low-productivity informal sectors into high-productivity formal sectors. This mechanism is important for two reasons. First, it contributes to the growth potential of developing countries and the absorption capacity for further capital accumulation. Second, labour reallocation will keep developing economies specialized in low-skilled intensive products in the coming decades and it will keep the wages of low-skilled workers low. We analyse this mechanism by simulating an increase in the skill intensity of developing countries the coming decades. These simulations are carried out with WorldScan, a dynamic AGE model of the world economy. An increasing skill intensity in LDCs will stimulate the global supply of high-skilled intensive products more than the supply of low-skilled intensive products, but to a much lesser extent than one would expect in static analyses or in absence of informal sectors.     

Volatility and Price Jumps in Agricultural Futures Prices—Evidence from Wheat Options

Evidence suggests that agricultural futures price movements have fat-tailed distributions and exhibit sudden and unexpected price jumps. There is also evidence that the volatility of futures prices is time-dependent both as a function of calendar-time (seasonal effect) and time to maturity (maturity effect). This article extends Bates' (1991) jump-diffusion option pricing model by including both seasonal and maturity effects in the volatility specification. Both in-sample and out-of-sample procedures to fit market option prices on wheat futures show that the suggested model outperforms previous published models. A numerical example shows the magnitude of pricing errors for option valuation.     

Vertical Control and Price Cycles in Gasoline Retailing

We examine Norwegian gasoline pump prices using daily station‐specific observations from 2003 to 2006. The four big gasoline companies use a vertical restraint that is adopted industry‐wide (labeled price support). This moves price control from the hands of independent retailers into the hands of the headquarters. Retail gasoline prices follow a fixed weekly pattern, where we observe de facto simultaneous decision‐making by the headquarters (without knowledge of their rivals’ prices) when every Monday around noon they decide to increase pump prices to the same level. The price level on Mondays corresponds to the recommended prices published by the headquarters of the gasoline companies.     

Resistance to Change in the Corporate Elite: Female Directors’ Appointments onto Nordic Boards

In this empirical study, we investigate the variation in firms’ response to institutional pressure for gender-balanced boards, focusing specifically on the preservation of prevailing practices of director selection and its impact on the representation of women on the board of directors. Using 8 years of data from publicly listed Nordic corporations, we show societal pressure to be one of the determinants of female directorship. Moreover, in some corporations, the director selection process may work to maintain “a traditional type of board”. In such boards, demographic diversity among male members appears to be associated with a lower share of female directors, although we cannot establish wether this reflects discrimination or a desire to maintain critical competencies. With this paper we add to the theoretical understanding of the factors underlying female board appointments by adopting an institutional theory lens to study female board representation. Viewing the demands for gender-balanced boards in terms of societal pressure for the de-institutionalization of the prevailing norms and practices, we highlight preferences for maintaining established practices as a potentially important barrier to institutional change. On these grounds, we conjecture on the relationship between the gender diversity of boards and other diversity dimensions. We suggest that a board room gender quota (if implemented) is supplemented by policies to ensure the transparency of board changes, in order to prevent the crowding out of other diversity dimensions.