Letter to Mr. Robert Nelles from Robert Heron

Letter to Mr. Robert Nelles from Robert Heron regarding 10 pounds, 12 shillings and 6 pence that Mr. Heron owes to Mr. Nelles. He is asking for 6 weeks of indulgence as he is not able to make the payment at present, Aug. 7, 1849.

Cave of the Winds on the American Side Poster

Cave of the Winds on the American Side. This poster contains a poem by Mary S. Pond called Cave of the Winds, 35 cm. x 19 cm. The guides are listed as F.H. Johnson and Son. There is a portion of the poster missing from the upper left hand corner. This does affect the text. This newsprint article is mounted in a cardboard frame, 1860.

The works of Edgar Allan Poe

UANL

Wage Policy of Firms: an Empirical Investigation.

This paper analyzes the dynamics of wages and workers' mobility within firms with a hierarchical structure of job levels. The theoretical model proposed by Gibbons and Waldman (1999), that combines the notions of human capital accumulation, job rank assignments based on comparative advantage and learning about workers' abilities, is implemented empirically to measure the importance of these elements in explaining the wage policy of firms. Survey data from the GSOEP (German Socio-Economic Panel) are used to draw conclusions on the common features characterizing the wage policy of firms from a large sample of firms. The GSOEP survey also provides information on the worker's rank within his firm which is usually not available in other surveys. The results are consistent with non-random selection of workers onto the rungs of a job ladder. There is no direct evidence of learning about workers' unobserved abilities but the analysis reveals that unmeasured ability is an important factor driving wage dynamics. Finally, job rank effects remain significant even after controlling for measured and unmeasured characteristics.

Trade Liberalization and the Profitability of Domestic Mergers.

It is often thought that a tariff reduction, by opening up the domestic market to foreign firms, should lessen the need for a policy aimed at discouraging domestic mergers. This implicitly assumes that the tariff in question is sufficiently high to prevent foreign firms from selling in the domestic market. However, not all tariffs are prohibitive, so that foreign firms may be present in the domestic market before it is abolished. Furthermore, even if the tariff is prohibitive, a merger of domestic firms may render it nonprohibitive, thus inviting foreign firms to penetrate the domestic market. In this paper, we show, using a simple example, that in the latter two cases, abolishing the tariff may in fact make the domestic merger more profitable. Hence, trade liberalization will not necessarily reduce the profitability of domestic mergers.

On Stackelberg Equilibria with Differentiated Products: the Critical Role of the Strategy Space.

Nous Considerons Dans Cet Article un Modele de Duopole Avec Produits Differencies; Nous Montrons Que le Caractere Substituts Vs Complements de Ces Produits Est un Facteur Important Dans la Determination du Mode de Concurrence Strategique (Cournot-Bertrand, Nash Mixte, Stackelberg; En Prix Ou Quantites) Que L'on Est Susceptible D'observer. Si les Produits Sont Substituts (Complements), la Concurrence Sera du Type Cournot (Bertrand) Plutot Que du Type Nash Mixte a Moins Qu'une Firme Puisse Affirmer Son Leadership et Forcer une Concurrence a la Stackelberg Mais Quel Soit le Role Tenu Par une Firme, Il Sera Preferable Pour Elle Que la Concurrence S'exprime En Quantite (Prix). Par Ailleurs, la Concurrence a la Bertrand Est Toujours la Meilleure du Point de Vue des Consommateurs et du Point de Vue de L'efficacite Sociale, et Ce, Que les Produits Soient Susbtituts Ou Complements.

Explaining the Persistence of Commodity Prices

This paper extends the Competitive Storage Model by incorporating prominent features of the production process and financial markets. A major limitation of this basic model is that it cannot successfully explain the degree of serial correlation observed in actual data. The proposed extensions build on the observation that in order to generate a high degree of price persistence, a model must incorporate features such that agents are willing to hold stocks more often than predicted by the basic model. We therefore allow unique characteristics of the production and trading mechanisms to provide the required incentives. Specifically, the proposed models introduce (i) gestation lags in production with heteroskedastic supply shocks, (ii) multiperiod forward contracts, and (iii) a convenience return to inventory holding. The rational expectations solutions for twelve commodities are numerically solved. Simulations are then employed to assess the effects of the above extensions on the time series properties of commodity prices. Results indicate that each of the features above partially account for the persistence and occasional spikes observed in actual data. Evidence is presented that the precautionary demand for stocks might play a substantial role in the dynamics of commodity prices.

Natural-Resource Exploitation with Costly Enforcement of Property Rights

This paper proposes a model of natural-resource exploitation when private ownership requires costly enforcement activities. For a given wage rate, it is shown how enforcement costs can increase with labor's average productivity on a resource site. As a result, it is never optimal for the site owner to produce at the point where marginal productivity equals the wage rate. It may even be optimal to exploit at a point exhibiting negative marginal returns. An important parameter in the analysis is the prevailing wage rate. When wages are low, further decreases in the wage rates can reduce the returns from resource exploitation. At sufficiently low wages, positive returns can be rendered impossible to achieve and the site is abandoned to a free-access exploitation. The analysis provides some clues as to why property rights may be more difficult to delineate in less developed countries. It proposes a different framework from which to address normative issues such as the desirability of free trade with endogenous enforcement costs, the optimality of private decisions to enforce property rights, the effect of income distribution on property rights enforceability, etc.

Probe-level linear model fitting and mixture modeling results in high accuracy detection of differential gene expression

Affiliation: Institut de recherche en immunologie et en cancérologie, Université de Montréal

Psychiatric services utilization in completed suicides of a youth centres population

Affiliation: Johanne Renaud & Claude Marquette : CHU Ste-Justine, Université de Montréal

The positive impact of red palm oil in school meals on vitamin A status: study in Burkina Faso

Affiliation: Augustin Zeba & Hélène Delisle : Département de nutrition, Faculté de médecine, Université de Montréal

Surface display of proteins by Gram-negative bacterial autotransporters

Affiliation: Faculté de Médecine Vétérinaire, Université de Montréal

Association between disruption of CD4 receptor dimerization and increased human immunodeficiency virus type 1 entry

Affiliation: Département de microbiologie et immunologie, Faculté de médecine, Université de Montréal & Institut de Recherches Cliniques de Montréal

Three rounds (1R/2R/3R) of genome duplications and the evolution of the glycolytic pathway in vertebrates

Affiliation: Henner Brinkmann : Département de biochimie, Faculté de médecine, Université de Montreal

Haplotype analysis suggest common founders in carriers of the recurrent BRCA2 mutation, 3398delAAAAG, in French Canadian hereditary breast and/ovarian cancer families

Affiliation: Faculté de médicine, Université de Montréal