Enriching a Theory of Wage and Promotion Dynamics Inside Firms

In previous work we showed that a model that integrates job assignment, human-capital acquisition, and learning can explain several empirical findings concerning wage and promotion dynamics inside firms. In this paper we extend that model in two ways. First, we incorporate schooling into the model and derive a number of testable implications that we then compare with the available empirical evidence. Second, and more important, we show that introducing task-specific' human capital allows us to produce cohort effects (i.e., the finding that a cohort that enters a firm at a low wage will continue to earn below-average wages years later). We argue that task-specific human capital is a realistic concept and may have many important implications. We also discuss limitations of our (extended) approach.

WHAT IS A HERPETOLOGIST AND HOW CAN I BECOME ONE?

The following is the first in the JNAH series in which we address a variety of topics on herpetology based on essays from our upcoming book “How to Be a Herpetologist,”. We will also answer frequently asked questions we and other professional herpetologists receive from students, colleagues, and the general public about herpetology as a career or an avocation

An analysis of contributory effects of teamwork characteristics within collegiate basketball and football

Few empirical studies have investigated the overall contribution of teamwork characteristics to collegiate sport team success. Additionally, there is little evidence determining the collective effects of teamwork characteristics among NCAA divisions of competition. The purpose of this research was to explore the relationships between six teamwork characteristics and successful teamwork within collegiate basketball and football. Subjects, comprised of 124 NCAA head football coaches and 95 head basketball coaches, returned self-reported questionnaires for the study. MANOVA, t-tests and Tukey\u27s Honestly Significant Difference tests were conducted on the subscales and determined that teamwork scores differ between the two sports. The results suggested that goal clarity and expert leadership were the primary contributors to overall teamwork scores within both sports and all levels of competition (p {dollar}\u3c{dollar}.05). Individual sport- and division-specific analyses also determined that the teamwork characteristics emerge in different quantities between the sports and among the divisions studied

On de-Sitter geometry in crater statistics

The cumulative size-frequency distributions of impact craters on planetary bodies in the solar system appear to approximate a universal inverse square power-law for small crater radii. In this article, we show how this distribution can be understood easily in terms of geometrical statistics, using a de-Sitter geometry of the configuration space of circles on the Euclidean plane and on the unit sphere. The effect of crater overlap is also considered.Comment: 6 pages, 2 figures, accepted by MNRAS. Version 2: title modified, appendix added, some small change

Rational combinations of Betti diagrams of complete intersections

We investigate decompositions of Betti diagrams over a polynomial ring within the framework of Boij-S\"oderberg theory. That is, given a Betti diagram, we determine if it is possible to decompose it into the Betti diagrams of complete intersections. To do so, we determine the extremal rays of the cone generated by the diagrams of complete intersections and provide a rudimentary algorithm for decomposition.Comment: This research was conducted at the Willamette Mathematics Consortium RE