AGE,TIME, VINTAGE,AND PRICE INDEXES: MEASURING THE DEPRECIATION PATTERN OF HOUSES

Age, time, and vintage are key determinants of house prices, yet they cannot be included together linearly or as dichotomous variables in hedonic regressions as construction time + age of house = sale time. We introduce a method where the estimates of the age, time, and vintage effects on prices are obtained in a flexible manner, without requiring us to specify a pre‐determined functional form for any of these variables. Applying our method to Dutch data, we find that the estimated depreciation pattern over the life of houses does not follow the functional forms typically specified for the age of houses in hedonic regressions. (JEL C43, E01, E31, R31)     

An experimental investigation of risk sharing and adverse selection

Does adverse selection hamper the effectiveness of voluntary risk sharing? How do differences in risk profiles affect adverse selection? We experimentally investigate individuals’ willingness to share risks with others. Across treatments we vary how risk profiles differ between individuals. We find strong evidence for adverse selection if individuals’ risk profiles can be ranked according to first-order stochastic dominance and only little evidence for adverse selection if risk profiles can only be ranked according to mean-preserving spreads. We observe the same pattern also for anticipated adverse selection. These results suggest that the degree to which adverse selection erodes voluntary risk sharing arrangements crucially depends on the form of risk heterogeneity.     

Face,Accounts, and Schemes in the Context of Relationship Breakups

This article investigates account strategies that individuals employ to neutralize identity threats caused by breakups from romantic relationships. I distinguish three narrative frames for such accounts: dumper, dumpee, and consensus narratives. Individuals who employ a consensus narrative frame provide accounts by default: they deny that any harm was done to anyone. Dumpers dismissed the breakup's conflictuality, used externalization strategies, and depicted themselves as empathetic. Dumpees used externalization strategies and denials of injury, emphasized their agency, and pointed out valuable changes of self. I then analyze the results from a phenomenological perspective to identify connections between accounting practices and the structure of the self. I argue that accounting for traumatic breakups is important for the development of schemes that guide perception, action, and the interpretation of biography.     

Towards a prospective technology assessment: challenges and requirements for technology assessment in the age of technoscience

The objective of this paper is to contribute to the expanding discourse on conceptual elements of TA. As a point of departure, it takes the recent transformation of the science, technology and innovation system (“technoscience”). We will show that the age of technoscience can be regarded as presenting not only a challenge, but also a chance and opportunity for TA. Embracing this opportunity, however, implies imposing several requirements on TA. In order to specify these requirements and to foster the ongoing discourse on the foundations of TA, this paper suggests a programmatic term: prospective technology assessment (ProTA). This term is intended mainly as a reflection framework, aimed at providing an extension and complement—and not a replacement—of well-established TA concepts. Three requirements for ProTA are sketched: (1) early stage orientation—the temporal dimension, (2) intention and potential orientation—the knowledge dimension, (3) shaping orientation—the power/actor dimension. Examples from fusion and nano research will illustrate the need for ProTA, as well as its specific focus. The paper concedes that ProTA is in its infancy and that there is a clear need for further clarification.     

Homosexual role separation: Implications for analyzing and modeling the spread of HIV

The analysis of the spread of HIV in homosexual populations must be based on knowledge of all factors which promote or inhibit transmission. Recently, data were reported from the Amsterdam cohort study that imply that sexual role separation and the changes therein should be taken into account in analyzing and modeling the spread of HIV. In this paper, a role separation mixing model is described and linked to data from the Amsterdam cohort. The model allows one to study the impact of homosexual role separation on the spread of HIV. The homosexual men are classified into four sexual subgroups based on the preference for: 1) no anal intercourse; 2) anal insertive only; 3) anal receptive only; 4) both insertive and receptive. The analysis accounts for variability and change in homosexual role behavior and loss to follow up. The results support the conjecture that there are large differences between the risks of receptive and insertive anal intercourse, with the latter carrying only minimal risk. The analysis indicates that the spread of HIV is mostly restricted to subgroup 4, the largest and sexually most active subgroup. In this subgroup, the estimated probability of HIV transmission from an infected insertive partner (in subgroup 2 or 4) to a receptive susceptible (in subgroup 4) is between 1 and 5 percent (assuming a closed cohort).     

Commercial sex between men: A prospective diary‐based study

This paper describes the results of a self‐reporting dairy completed by 186 male sex workers (MSWs) over a 2‐week period in Brisbane, Sydney, and Melbourne, Australia. The diary was completed following each commercial sex encounter by the MSW. The results reveal that MSWs reported 2088 commercial sex encounters during the study period, with an average of 11.2 encounters per MSW. The majority of sex encounters took place in either the client's or the MSW's residence, with significant variations by city. The average sexual encounter lasted 70 minutes, and comprised two sexual acts, masturbation and oral sex. Condom use was reported in 67.4% of all the encounters. Using the AIDS Council safe‐sex classification system, the majority of the commercial sex encounters fell in the “safer sex” category; however, there were significant differences by source of clients and place of the encounter. Use of drugs and alcohol reveal interesting patterns: Clients were more likely to use alcohol, while MSWs had significant differences of usage of the different drugs. This study demonstrates that the majority of MSWs are offering and practicing safe sex behaviours, however, MSWs working in the street setting are still likely to be practising unsafe sex. Male sex work is becoming an organised business and this provides opportunities to implement further public health interventions.     

Promoting Ethnic Entrepreneurship in European Cities: Sometimes Ambitious,Mostly Absent,Rarely Addressing Structural Features

An increasing number of immigrants have become entrepreneurial and many governments expect or hope that the ongoing rise of ethnic entrepreneurship will contribute significantly to the integration of immigrants, to their upward mobility, and to the economic development of the city of residence. In this article we explore the rules, regulations and policy interventions that shape self‐employment trajectories in general and those of immigrant ethnic minorities in particular. The article is based on a general inventory of measures to promote ethnic entrepreneurship in 32 European countries, and a somewhat deeper inventory of policies and interventions in 28 European cities. We came across all kinds of measures and interventions and identified certain patterns, but the most striking finding was that such explicit measures and interventions were actually thin on the ground. We conclude this article with a discussion of the structural determinants of this outcome.     

Horses and baseball: social work’s cultivation of one’s ‘third eye’

Active self-reflection is a sophisticated and subtle, multi-layered process that requires learning the capacity to constantly self-monitor. These fundamental interactive skills, the core of a competent social worker, are important to work in any context. Using two distinct metaphors, one relating to horses, the other to baseball, the article will explore the importance of developing competency skills and utilize a ‘third eye.’ In current social work education curricula the use of self may not be prioritized, practiced, or well understood. Evidence from human and veterinary medicine as well as social work, are discussed. An example of an undergraduate BSW course using simulated clients and standardized measures is discussed. The paper includes a brief review of the preliminary findings for a small pilot study and the relevance to future research is considered.