The Child Adoption Marketplace: Parental Preferences and Adoption Outcomes

In the United States child adoption costs vary considerably, ranging from no out-of-pocket expense to $50,000 or more. What are the causes for the variability in adoption expenses? We administered a survey to a sample of Michigan adoptive families to link adoptive parent characteristics, child characteristics, and adoption-related expenses and subsidies. We then estimate “hedonic” regressions in which adoption cost is a function of child characteristics. The analysis shows that most of the variation in adoption costs is explained by child characteristics. In particular, costs lower for older children, children of African descent, and special needs children. Findings inform policies regarding the transition of children from foster care to adoptive families.child welfare, adoption, subsidy

The Allocation and Dissipation of Resource Rents: Implications for Fishery Reform

In the move to adopt rights based arrangements for renewable resources to avoid the losses of open access and the inefficiencies of prescriptive regulation, we argue that grandfathering the allotments of local users can be the most efficient distribution mechanism. We differ from the standard support among economists for auctions which contends that auctions allocate rights to the highest valued users and thereby maximize rents. Our contention is that rents are not a fixed stock as is commonly assumed, but rather depend upon the actions of those who use the natural resource and convert it into valuable goods and services. First-possession allocation assigns ownership and rents to existing users, reinforcing their incentives for stewardship and rent maximization. Resource rents are an important source of wealth and well being, especially in developing countries. By contrast the alternative, auction allocation, assigns ownership to winning bidders, but the rents are captured by the auctioneer, often the state, not local agents. We argue that there can be important efficiency effects. Our empirical focus is on fisheries, but the implications extend to other settings.

Higher-order perturbation solutions to dynamic, discrete-time rational expectations models

We present an algorithm and software routines for computing nth order Taylor series approximate solutions to dynamic, discrete-time rational expectations models around a nonstochastic steady state. The primary advantage of higher-order (as opposed to first- or second-order) approximations is that they are valid not just locally, but often globally (i.e., over nonlocal, possibly very large compact sets) in a rigorous sense that we specify. We apply our routines to compute first- through seventh-order approximate solutions to two standard macroeconomic models, a stochastic growth model and a life-cycle consumption model, and discuss the quality and global properties of these solutions.Macroeconomics - Econometric models ; Business cycles ; Monetary policy

Evidence for glaciation in Elysium

It is suggested that certain landforms in the Elysium region of Mars provide strong evidence for glaciation. Landscapes related to subglacial volcanism suggest that ice was a primary agent in the development of Elysium

Grain Marketing Strategies of North Dakota Grain Farmers

The basic objective of this report is to discuss the factors considered and the methods that are used by small-grain farmers in the marketing of their products. The figures and discussions which appear in this report are not meant to be an inclusive average of all farmers in North Dakota, but rather a consensus of specific groups of farmers engaged primarily in producing small-grains with limited income from other sources. It is hoped that this report will serve as a useful reference in helping North Dakota small-grain producers identify possible marketing alternatives and strategies available.Marketing,

Efficiency Advantages of Grandfathering in Rights-Based Fisheries Management

We show that grandfathering fishing rights to local users or recognizing first possessions is more dynamically efficient than auctions of such rights. It is often argued that auctions allocate rights to the highest-valued users and thereby maximize resource rents. We counter that rents are not fixed in situ, but rather depend additionally upon the innovation, investment, and collective actions of fishers, who discover and enhance stocks and convert them into valuable goods and services. Our analysis shows how grandfathering increases rents by raising expected rates of return for investment, lowering the cost of capital, and providing incentives for collective action.Fishing rights, property rights, allocating fishing rights, grandfathering fishing rights, auctions of fishing rights, fisheries rent

Evolution of antigen binding receptors

This review addresses issues related to the evolution of the complex multigene families of antigen binding receptors that function in adaptive immunity. Advances in molecular genetic technology now permit the study of immunoglobulin (Ig) and T cell receptor (TCR) genes in many species that are not commonly studied yet represent critical branch points in vertebrate phylogeny. Both Ig and TCR genes have been defined in most of the major lineages of jawed vertebrates, including the cartilaginous fishes, which represent the most phylogenetically divergent jawed vertebrate group relative to the mammals. Ig genes in cartilaginous fish are encoded by multiple individual loci that each contain rearranging segmental elements and constant regions. In some loci, segmental elements are joined in the germline, i.e. they do not undergo genetic rearrangement. Other major differences in Ig gene organization and the mechanisms of somatic diversification have occurred throughout vertebrate evolution. However, relating these changes to adaptive immune function in lower vertebrates is challenging. TCR genes exhibit greater sequence diversity in individual segmental elements than is found in Ig genes but have undergone fewer changes in gene organization, isotype diversity, and mechanisms of diversification. As of yet, homologous forms of antigen binding receptors have not been identified in jawless vertebrates; however, acquisition of large amounts of structural data for the antigen binding receptors that are found in a variety of jawed vertebrates has defined shared characteristics that provide unique insight into the distant origins of the rearranging gene systems and their relationships to both adaptive and innate recognition processes

Analyzing Repeated Measures Marginal Models on Sample Surveys with Resampling Methods

Packaged statistical software for analyzing categorical, repeated measures marginal models on sample survey data with binary covariates does not appear to be available. Consequently, this report describes a customized SAS program which accomplishes such an analysis on survey data with jackknifed replicate weights for which the primary sampling unit information has been suppressed for respondent confidentiality. First, the program employs the Macro Language and the Output Delivery System (ODS) to estimate the means and covariances of indicator variables for the response variables, taking the design into account. Then, it uses PROC CATMOD and ODS, ignoring the survey design, to obtain the design matrix and hypothesis test specifications. Finally, it enters these results into another run of CATMOD, which performs automated direct input of the survey design specifications and accomplishes the appropriate analysis. This customized SAS program can be employed, with minor editing, to analyze general categorical, repeated measures marginal models on sample surveys with replicate weights. Finally, the results of our analysis accounting for the survey design are compared to the results of two alternate analyses of the same data. This comparison confirms that such alternate analyses, which do not properly account for the design, do not produce useful results.

THE ADOPTION AND DIFFUSION OF LEVEL FIELDS AND BASINS

Strategic investments in agriculture often are lumpy and irreversible, with significant impacts on operating and fixed costs. Leveling cotton fields to zero slope in central Arizona is a strategic decision made by relatively younger farmers who are farming fine-textured soils in irrigation districts with higher expected water costs. The diffusion of the technology across the region between 1968-89 appears to be both a function of institutional changes (e.g., the Groundwater Management Act of 1980, the Central Arizona Project) and the long-run expected price changes induced by these new policies.Crop Production/Industries,