Urban birds and planting design: strategies for incorporating ecological goals into residential landscapes

Urban Ecosystems - Private residential property occupies a major part of the urban land base, yet considerable potential remains for improving the ecological performance of private gardens and...     

ECONOMIC GROWTH REGRESSIONS FOR THE AMERICAN STATES: A SENSITIVITY ANALYSIS

We use extreme-bounds analysis to assess the sensitivity of numerous control variables identified in the state growth literature. We employ annual panel data on the American states to identify which variables are robust to small changes in the conditioning information set. The results provide a set of core variables as a starting point for future research that relies on state growth regressions. The findings also demonstrate that several important conclusions in the literature depend on how variables are measured. ( JEL R11, O23, C23, 018)     

THE EXCHANGE VALUE OF NONPECUNIARY BENEFITS

Several important contributions to the property rights literature develop the point that different institutional arrangements lead to differences in the relative cost of income in pecuniary form versus income in nonpecuniary form. This analytical framework is rich in positive content, although few attempts have been made to measure directly the exchange value of nonpecuniary income. This paper posits a simple method for approximating the exchange value of nonpecuniary rewards and offers some estimates of this value for a particular occupational category: namely, scientists in the United States. The results of this estimation indicate that nonpecuniary benefits are an important component of total remuneration in government employment relative to private sector employment for this occupational group.     

Risk behaviors and perceptions of AIDS among street injection drug users

Standardized survey interviews (n = 325) and guided in-depth interviews (n = 22) were conducted with injection drug users (IDUs) in Long Beach, California, to document drug usage and injection patterns, sexual practices, perceived risk of HIV infection, sources of health information, and knowledge and attitudes about AIDS. Most IDUs reported sharing needles (87.9%), and a large minority reported regular sterilization of needles/syringes (40.3%). Lower rates of needle sharing were reported among cocaine users than among heroin and speedball users. HIV seroprevalence was 5.7 percent (11/194). Sexually active female (60.7%) and male (20.5%) IDUs reported exchanging sex for money or drugs. Overall, 48.3 percent of IDUs reported having made changes in their injection practices and one-third reported modifying their sexual behavior in order to avoid HIV infection. Differences in drug use, sexual practices, and drug treatment history were found with regard to gender, ethnicity, age, and type of drug injected. Implications of findings for the development of AIDS risk-reduction programs are presented.     

Structure of Uncertainty and Decision Making: An Experimental Investigation*

Decisions in the real world usually involve imprecise information or uncertainty about the precesses by which outcomes may be determined. This research reports the results of a laboratory experiment which examined whether the structure of uncertainty, namely, both the center and the range of the probability distribution describing the uncertainty, is an important determinant of choice. Specifically, it examines how the uncertainty of audit by the Internal Revenue Service of income tax returns affects taxpayers' decisions about intentional noncompliance. The context is relevant as almost nothing is known about how taxpayers assess detection risks using the probability information they have. The study focuses on intentional noncompliance. The factors affecting it are distinct and separate from those affecting unintentional noncompliance. Other factors that affect intentional tax noncompliance, such as risk, tax rates, and penalty rates, were controlled in the experiment. It was hypothesized that the lower the mean and the lesser the range (ambiguity) of the perceived audit probability, the greater the international noncompliance. As hypothesized, the analysis indicates that both the mean and the range of the perceived audit probability rate affect intentional noncompliance, though the effect of ambiguity is greater at a relatively higher level of mean. This result suggests that the strength of the information describing an uncertain event is captured better by both the mean and the range of the uncertainty than either of those components singly.