Structural Drift: The Population Dynamics of Sequential Learning

We introduce a theory of sequential causal inference in which learners in a chain estimate a structural model from their upstream teacher and then pass samples from the model to their downstream student. It extends the population dynamics of genetic drift, recasting Kimura's selectively neutral theory as a special case of a generalized drift process using structured populations with memory. We examine the diffusion and fixation properties of several drift processes and propose applications to learning, inference, and evolution. We also demonstrate how the organization of drift process space controls fidelity, facilitates innovations, and leads to information loss in sequential learning with and without memory.Comment: 15 pages, 9 figures; http://csc.ucdavis.edu/~cmg/compmech/pubs/sdrift.ht

An Examination of Additively Separable Willingness-To-Pay for Environmental Attributes: Evidence from a Pork Experiment

This paper examines what is the best method for pork producers to market pork products with environmental attributes. The objective is to examine evidence of whether it is beneficial for pork producers to incorporate multiple environmental attributes into a single product or sell multiple products with a single environmental attribute.Environmental Economics and Policy,

THE POTENTIAL FOR MARKETING PORK PRODUCTS WITH EMBEDDED ENVIRONMENTAL ATTRIBUTES: RESULTS FROM AN EXPERIMENTAL STUDY

Environmental issues such as air and water quality related to livestock production currently receive much attention. Potential methods for environmental improvement range from regulation to market solutions. This study looks at consumer willingness to pay for pork products with embedded environmental attributes. Experimental auctions showed that over one-half of the participants (62%) paid a premium, that did not vary significantly between differing regions of the United States.Environmental Economics and Policy, Livestock Production/Industries, Marketing, Q13, Q25,

Reducing Undesirable Environmental Impacts in the Marine Environment: A Review of Market-Based Incentive Management Measures

Using the example of commercial fishing, this paper explores the potential of incentive based management measures as a means of reducing the undesirable impacts of industries operating within the marine environment. Despite having been successfully applied for similar purposes in the management of terrestrial environments, and their potential to achieve environmental gains in an economically efficient manner, examples of incentive based management mechanisms are still relatively limited in the marine context. We assess the potential of a number of alternative market based management measures by reviewing and considering the successes and limitations of previous applications and how these would translate in the case of commercial fishing. Several fishing methods and conservation values are considered and the circumstances in which incentive measures may be most applicable are identified. Where appropriate, and by either replacing or (more likely) complimenting existing management arrangements, incentive based measures have the potential to improve upon the performance of existing measures. This has a number of implications. From the environmental perspective they should allow the expected level of undesirable impact to be reduced. They can also reduce the costs imposed upon the industry by letting them develop the solutions. Further, in the increasingly relevant case of MPAs the potential costs to Government may also be significantly reduced if increasing environmental performance makes it possible for certain industry members to continue operating, reducing the necessity of often costly structural adjustment programs.Environmental Economics and Policy,

INTERPRETING BIDS FROM A VICKREY AUCTION WHEN THERE ARE PUBLIC GOOD ATTRIBUTES

This paper provides a model that allows for interpreting bids in a Vickrey auction when the good has public good attributes. It also examines information obtained from a Vickrey auction, which collected consumer's willingness-to-pay for pork products that had embedded environmental attributes, and applies the new interpretation to the bids.Consumer/Household Economics,