Comparing HIV risk-related behaviors between 2 RDS national samples of MSM in Brazil, 2009 and 2016

Periodic monitoring of sociobehavior characteristics at a national level is an essential component of understanding the dynamics the human immunodeficiency virus (HIV) epidemic worldwide, including Brazil. We compare descriptive sociobehavior characteristics in 2 national cross-sectional HIV biological behavioral surveillance surveys (BBSS) conducted in 2009 and 2016 among men who have sex with men (MSM) in Brazil. Respondent driven sampling (RDS) was used for recruitment in both years. Overall proportions were weighted according to Gile's estimator using RDS Analyst Software and 95% confidence intervals were calculated for comparisons between the 2 periods. Further comparisons were stratified by age groups (<25 and 25+). Overall, 3749 and 4176 MSM were recruited in 2009 and 2016, respectively. In 2016, participants were younger than 25 years old (58.3%), with 12 or more years of education (70.4%), with higher socioeconomic status (40.7%), and had a higher proportion of whites (31.8%), as compared to 2009. Also, participants in 2016 reported less alcohol use and binge drinking, but used illicit drugs more frequently. There was an increase among MSM who self-reported their HIV risk as low and had low HIV knowledge while the proportion of those who were never tested for HIV dropped from 49.8% in 2009 to 33.8% in 2016. Although more than three-quarters received free condoms in both years, STD counseling remained low (32% and 38% for 2009 and 2016, respectively). Sexual risk behavior remained at high levels, especially unprotected anal receptive sex and sex with multiple partners. Younger MSM showed riskier sexual practices than those 25+ years old, when comparing 2016 to 2009. Results indicate a worrisome risk behavior trend among Brazilian MSM, especially younger ones. These results can contribute for a better understanding of the HIV epidemics in Brazil, with timely shift in strategies so improved effectiveness in public health prevention efforts can be achieved

Risk and Rationalization – The role of affect and cognitive dissonance for sexual risk taking

This paper analyzes the mechanisms underlying excessive sexual risk taking in the presence of HIV. Drawing ideas from psychology on decision-making processes and risk evaluation, a theoretical model interacting affect-induced myopia and cognitive dissonance is developed and analyzed. The results of the theoretical analysis suggest that the effect of rationalization of personal risk depends on the risk of being HIV positive. Although rationalization causes excessive risk taking behavior for individuals with a relatively low lifetime risk, it may prevent fatalism among individuals whose lifetime risk of HIV is perceived as overwhelming.HIV/AIDS; Self-control; Time inconsistency; Dissonance theory; Regret

The Politics of Trade Liberalization in the Presence of FDI Incentives

This paper examines whether inward FDI incentives can soften the political constraints associated with trade liberalization. After introducing the role of capital inflows into the political economy of trade framework pioneered by Grossman and Helpman (1994, 1995 and 1996), the paper traces the e¤ects of FDI incentives on the politically sustainable equilibrium level of trade protection. In particular, the paper shows that FDI incentives reduce the politically sustainable level of trade protection when capital-owners are politically organized, while they inhibit the process of trade liberalization when labor is the main influential political force. Welfare implications are also considered.

Phononless thermally activated transport through a disordered array of quantum wires

Phononless plasmon assisted transport through a long disordered array of finite length quantum wires is investigated analytically. Two temperature regimes, the low- and the high-temperature ones, with qualitatively different temperature dependencies of thermally activated resistance are identified. The characteristics of plasmon assisted and phonon assisted transport mechanisms are compared. Generically strong electron-electron interaction in quantum wires results in a qualitative change of the temperature dependence of thermally activated resistance in comparison to phonon assisted transport. At high temperatures, the thermally activated resistance is determined by the Luttinger liquid interaction parameter of the wires.Comment: 15 pages, 1 figur

Understanding the Fine Structure of Electricity Prices.

This paper analyzes the special features of electricity spot prices derived from the physics of this commodity and from the economics of supply and demand in a market pool. Besides mean-reversion, a property they share with other commodities, power prices exhibit the unique feature of spikes in trajectories. We introduce a class of discontinuous processes exhibiting a jump-reversion component to properly represent these sharp upward moves shortly followed by drops of similar magnitude. Our approach allows to capture - for the first time to our knowledge - both the trajectorial and the statistical properties of electricity pool prices. The quality of the fitting is illustrated on a database of major US power markets.Energy price risk; Simulation; Calibration; Statistical estimations; Jump diffusions; Electricity prices;

Do Depositors Discipline Swiss Banks?

In this paper, we test for the presence of market discipline in the Swiss deposit market. In particular, we examine whether depositors monitor their banks by withdrawing their saving deposits whenever the fundamentals of their bank is no longer satisfactory. We use a panel of bank-specific data an 250 Swiss banks over the period 1987-1998. We find considerable evidence of market discipline, in the sense that depositors are sensitive to bank-specific fundamentals, to institutional differences across bank groups, and to institutional changes in the Swiss depositor protection system. Our study complements the existing literature which predominantly builds on price indicators of market discipline (like yield spreads) by an approach based on quantities (the uninsured share of deposits). As few banks have traded debt outstanding, our approach is applicable to a much larger number of banks, including banks from non-industrialized countries.

Sexual Risk Taking among Young Adults in Cape Town - Effects of Expected Health and Income

This paper empirically assesses links between expectations of future health and income on sexual risk taking on a sample of young adults in Cape Town, South Africa. An important contribution of the paper lies in combining a wide range of variables measuring risky sexual behavior such that the maximum information possible is extracted from, and adequate weights are attached to each measure, as opposed to previous studies that are based on individual measures or arbitrary aggregations. The findings indicate that expected income and health and future uncertainty are significant determinants of current patterns of sexual risk taking. From a policy perspective, the results suggest that reducing poverty and improving social insurance as well as reducing the taboo related to talking about HIV may constitute important issues to be addressed.HIV/AIDS; Health risk; Risk aversion