Invasive Annual Grass Issues in Canadian Rangelands

It has been understood for several years now that Canadian grasslands are among the world’s most endangered ecosystems. While the endangerment of the world’s coral reefs and rainforests may make the news more often, the increasingly fast decline of native Canadian grasslands is having a major impact on species diversity as well as global carbon supplies. In this paper, I will discuss the impact invasive annual grasses have had on two important rangeland ecosystems in Canada. Furthermore, strategies for protecting and restoring these invaluable lands will be discussed

Can foreign lobbying enhance development ? The case of tourism in the Caribbean

There exist legal channels for informational lobbying of U.S. policymakers by foreign principals. Foreign governments and private sector principals frequently and intensively use this institutional channel to lobby on trade and tourism issues. The authors empirically study whether such lobbying effectively achieves its goal of trade promotion in the context of Caribbean tourism and it is the first paper to examine the potential for using foreign lobbying as a vehicle for development. They use panel data to explore and quantify the association between foreign lobbying by Caribbean principals and U.S. tourist arrivals to Caribbean destinations. A variety of sensitivity analyses support the finding of a strong association. The policy implications are obvious and potentially important for developing countries.Tourism and Ecotourism,Economic Theory&Research,Accommodation&Tourism Industry,Political Systems and Analysis,Politics and Government

Releasing constraints to growth or pushing on a string ? the impact of credit, training, business associations, and taxes on the performance of Mexican micro-firms

The authors employ propensity score matching and a traditional control function approach to examine the impact of participation in various societal institutions on microfirm performance in Mexico. They find that firms that participate in credit markets, receive training,pay taxes, and belong to business associations exhibit significantly higher profits, even after controlling for the various factors that drive participation in those institutions. They also find that firms that borrow from formal or informal sources and those that pay taxes are significantly more likely to stay in business, but firms that received credit exhibit lower rates of income growth. Overall, the results suggest that even if the best performing micro-firms are more likely to be selected into participating in societal institutions, causality also runs in the opposite direction. In particular, increases in strictly or broadly defined formality have the potential for increasing profits and survival rates, and appear to bring micro-firms closer to their optimal sizes.Economic Theory&Research,Science Education,Scientific Research&Science Parks,Investment and Investment Climate,Educational Sciences

Does Formality Improve Micro-Firm Performance? Quasi-Experimental Evidence from the Brazilian SIMPLES Program

This paper employs regression discontinuity methods to identify the effect of formality on Brazilian micro-firm performance. The SIMPLES program introduced in November 1996 consolidated multiple taxes and social security contributions into a single payment and reduced taxes for eligible small firms. This provides a quasi-natural experiment that allows us to eliminate many of the endogeneity issues surrounding the impact of formality, measured across several dimensions, on firm performance. We find that SIMPLES had a significant effect on the proportion of firms that have a license to operate, are registered as a legal entity, pay taxes and make social security contributions. Moreover, newly created firms that opt for operating formally achieve higher levels of revenue and profits, employ more workers and are more capital intensive (only for those firms that have employees). The channel through which this occurs is not access to credit or contracts with larger firms. Rather, it appears that the lower cost of contracting labor leads to adopting production techniques that involve greater permanence and a larger paid labor force.micro-firms, self-employment, informality

Planning Routes Across Economic Terrains: Maximizing Utility, Following Heuristics

We designed an economic task to investigate human planning of routes in landscapes where travel in different kinds of terrain incurs different costs. Participants moved their finger across a touch screen from a starting point to a destination. The screen was divided into distinct kinds of terrain and travel within each kind of terrain imposed a cost proportional to distance traveled. We varied costs and spatial configurations of terrains and participants received fixed bonuses minus the total cost of the routes they chose. We first compared performance to a model maximizing gain. All but one of 12 participants failed to adopt least-cost routes and their failure to do so reduced their winnings by about 30% (median value). We tested in detail whether participants’ choices of routes satisfied three necessary conditions (heuristics) for a route to maximize gain. We report failures of one heuristic for 7 out of 12 participants. Last of all, we modeled human performance with the assumption that participants assign subjective utilities to costs and maximize utility. For 7 out 12 participants, the fitted utility function was an accelerating power function of actual cost and for the remaining 5, a decelerating power function. We discuss connections between utility aggregation in route planning and decision under risk. Our task could be adapted to investigate human strategy and optimality of route planning in full-scale landscapes

A Decade Of Starspot Activity On The Eclipsing Short-Period RS Canum Venaticorum Star WY Cancri: 1988-1997

We present optical photometry of the short-period eclipsing RS CVn system WY Cancri for the years 1988–1997. For each light curve, we model the distortion waves in order to study the behavior of starspots in this system. After removing the spot effects f

A Framework for the Landscape

It seems likely that string theory has a landscape of vacua that includes very many metastable de Sitter spaces. However, as emphasized by Banks, Dine and Gorbatov, no current framework exists for examining these metastable vacua in string theory. In this paper we attempt to correct this situation by introducing an eternally inflating background in which the entire collection of accelerating cosmologies is present as intermediate states. The background is a classical solution which consists of a bubble of zero cosmological constant inside de Sitter space, separated by a domain wall. At early and late times the flat space region becomes infinitely big, so an S-matrix can be defined. Quantum mechanically, the system can tunnel to an intermediate state which is pure de Sitter space. We present evidence that a string theory S-matrix makes sense in this background and contains metastable de Sitter space as an intermediate state.Comment: 29+13 pages, 25 figures; v2: minor corrections, references adde

Ethnolinguistic data on human origin in Selkup

This paper focuses on interdisciplinary research of an important cultural phenomenon – human origin – based on Selkup language, folklore and culture. Selkups are indigenous peoples of Western Siberia belonging to the Uralic language family and sharing cultural features with their neighbors; for example, Kets, Khanty, Evenks, and Siberian Turks. This research could reveal a significant body of human culture, observe how a language reflects people's cognition, and provide ethnolinguistic data for further comparative studies