Evolution of urban housing stocks: A model applied to Baltimore and Houston

Historical simulations of urban residential growth in Baltimore and Houston based on a model of the growth process which has two distinct components are presented. The vintage component utilizes the growth of income and population, and an assumption that housing is putty-clay, to predict the age distribution of the housing stock in each period. The spatial component of the model determines where this housing construction will take place according to (1) housing is built on vacant land and (2) the pattern of construction obeys the rules of the standard monocentric models. Housing is demolished when economically obsolete. The putty-clay (vintage) aspect of the model produces fairly accurate city-wide vintage distributions, but there is much more mixing of vintages and income (in Baltimore) by location than predicted, even under monocentric assumptions most favorable to mixing.     

Should direct or total factor intensities be used in tests of the factor proportions hypothesis?

Zusammenfassung Sollten direkte oder totale Faktorintensit?ten beim Test der Faktorproportionenhypothese verwendet werden? — Dieser Aufsatz befa\t sich mit der Faktorproportionenhypothese und den Faktorintensit?ten, mit denen die Hypothese getestet werden kann. Wenn alle Güter einschlie\lich der Zwischenprodukte handelbar sind und wenn es keine Spezialisierung in der Produktion gibt, dann sind die direkten Faktorintensit?ten ma\gebend, wenn die Allokation der Bruttoproduktion zwischen den L?ndern erkl?rt werden soll. Demgegenüber sind die totalen Faktorintensit?ten für die Erkl?rung der Nettohandelsstr?me relevant. Wenn es nichthandelbare Güter gibt, dann sollten die Faktorintensit?ten der handelbaren Güter so modifiziert werden, da\ sie den direkten Faktorinput aller nichthandelbaren Güter einschlie\en, die bei der Produktion von handelbaren Gütern verbraucht werden. Die Ergebnisse zeigen sich in strenger Form, wenn die Anzahl der handelbaren Güter und der Faktoren gleich ist. übersteigt die Anzahl der handelbaren Güter die der Faktoren, dann besteht eine Tendenz zur Spezialisierung in der Produktion. Liegt dieser Fall der Spezialisierung vor, werden zudem alle Güter gehandelt und existieren keine nichthandelbaren Güter, besteht immer noch die Beziehung zwischen den direkten Faktorintensit?ten und der Allokation der Bruttoproduktion, w?hrend die totalen Faktorintensit?ten mit den Handelsstr?men nicht mehr so deutlich zusammenh?ngen.

---

Résumé Doit-on appliquer les intensités des facteurs directes ou totales pour tester l’hypothèse des proportions des facteurs? — Cet article s’occupe de l’hypothèse des proportions des facteurs et des intensités des facteurs avec lesquelles on peut la tester. Si tous les biens, les inputs intermédiaires inclus, sont commerces et s’il n’y a pas une spécialisation dans la production, les intensités des facteurs directes sont importantes pour expliquer l’allocation de la production brute parmi des pays; pendant que les intensités des facteurs totales sont d’importance pour expliquer les flux commerciaux nets des biens. De plus, s’il y a des biens non-commercés, les intensités des facteurs des biens commercés devraient être modifiées de manière à inclure les inputs directs des facteurs dans le montant total des biens non-commercés qui sont utilisés dans la production des biens commercés. Ces résultats sont rigoureusement dérivés si les biens commercés et les facteurs sont de même nombre. Si le nombre des biens commercés excède le nombre des facteurs, il y a une tendance à la spécialisation dans la production. Dans ce cas et si tous les biens sont commercés et s’il n’y a pas des biens non-commercés, les intensités des facteurs directes sont encore d’importance pour l’allocation de la production brute, pendant que les intensités des facteurs totales sont moins d’importance pour les flux commerciaux, comparé avec le cas où il n’y a pas une spécialisation dans la production.

---

Resumen Deberían utilizarse las intensidades de factores directas o totales en los ensayos de la hipótesis de proporción de factores? — Este artículo se ocupa de la hipótesis de proporción de factores y las intensidades de factores con las que las hipótesis pueden ser sometidas a prueba. Si todos los bienes, incluyendo inputs intermedios, son comerciados y no hay especializaci?n en la produeei?n, las intensidades de factores directas son relevantes para explicar la asignaei?n de la produeeión bruta entre países; considerando que las intensidades de factores totales son relevantes para explicar los rlujos netos del comercio de bienes. Más aún, si hay bienes no comerciables, las intensidades de factores de bienes comerciables deberían modificarse de tal manera de incluir los inputs factoriales directos en los montos totales de bienes no comerciables utilizados en la produeeión de bienes comerciables. Estos resultados se muestran rigurosamente para el caso de un númro igual de bienes transables y de factores. Si el número de bienes transables sobrepasa el número de factores, hay una tendencia hacia la especialización en la produeeión. Para tal caso, con comercio en todos los bienes y sin bienes no transables, la intensidad directa de factores est’ aún relacionada con la asignaeión de la produeeión bruta; considerando que las intensidades totales de factores están relacionadas con los flujos comerciales, aunque menos claramente que sin especialización en la produeeión.

     

Repeat‐Sales Indexes: Estimation without Assuming that Errors in Asset Returns Are Independently Distributed

This article proposes an alternative specification for the second stage of the Case‐Shiller repeat‐sales method. This specification is based on serial correlation in the deviations from the mean one‐period returns on the underlying individual assets, whereas the original Case‐Shiller method assumes that the deviations from mean returns by the underlying individual assets are i.i.d. The methodology proposed in this article is easy to implement and provides more accurate estimates of the standard errors of returns under serial correlation. The repeat‐sales methodology is generally used to construct an index of prices or returns for unique, infrequently traded assets such as houses, art and musical instruments, which are likely to be prone to exhibit serial correlation in returns. We demonstrate our methodology on a data set of art prices and on a data set of real estate prices from the city of Amsterdam.     

Retail Market Power in a Shopping Basket Model of Supermarket Competition

Supermarket retailers typically operate with relatively low margins, suggesting a highly competitive retail environment. However, despite the fact that consumers purchase an entire shopping basket at a time from supermarkets, this evidence is largely based on models of retail competition with single-category purchases. In this paper, we develop and test an empirical model of retail price competition that explicitly accounts for the effect of demand complementarity among items in consumer shopping baskets. Relative to the case where consumers purchase products with independent demands, we demonstrate that equilibrium prices are higher for all items when retailers take demand-complementarity into account. Our findings indicate that non-price strategies intended to encourage complementarity, such as co-merchandising, strategic shelf-positioning, or featuring complementary goods tend to soften price competition, and lead to higher equilibrium prices.     

Identification and estimation of Gaussian affine term structure models

This paper develops new results for identification and estimation of Gaussian affine term structure models. We establish that three popular canonical representations are unidentified, and demonstrate how unidentified regions can complicate numerical optimization. A separate contribution of the paper is the proposal of minimum-chi-square estimation as an alternative to MLE. We show that, although it is asymptotically equivalent to MLE, it can be much easier to compute. In some cases, MCSE allows researchers to recognize with certainty whether a given estimate represents a global maximum of the likelihood function and makes feasible the computation of small-sample standard errors.     

To Screen or Not to Screen? Using the Internet for Selection Decisions

Organizations are increasingly relying on Internet searches and social networking websites to uncover detailed and private information about job applicants. Such Internet screening techniques have the potential to provide additional information beyond that found using traditional screening approaches. However, questions regarding the legality and appropriateness of this practice, as well as issues regarding the standardization, reliability, and validity of the information obtained, need to be addressed. The current work describes these issues associated with Internet screening and provides recommendations to help ensure this practice is used appropriately in organizations. Suggestions for future research on Internet screening are also discussed.     

Arrival Cohort, Assimilation, and the Earnings of Caribbean Women in the United States

Utilizing data on U.S.-born and Caribbean-born black women from the 1980–2000 U.S. Censuses and the 2000–2007 waves of the American Community Survey, I document the impact of cohort of arrival, tenure of U.S. residence, and country/region of birth on the earnings and earnings assimilation of black women born in the English-, French-, and Spanish-speaking Caribbean. I also test whether selective migration accounts for earnings differences between U.S.-born and Caribbean-born black women in the United States. I show that almost all arrival cohorts of Caribbean women earn less than U.S.-born black women when they first arrive in the United States. However, over time the earnings of early arrival cohorts from the English- and French-speaking Caribbean are projected to surpass the earnings of U.S.-born black women. Indeed, this crossover is most pronounced for women from the English-speaking Caribbean. In models that account for selective migration by comparing the earnings of Caribbean women to U.S.-born black women who have moved across states since birth, I show that more time is required for early arrival cohorts from the English- and French-speaking Caribbean to surpass the earnings of U.S.-born black internal migrants. Women from the Spanish-speaking Caribbean do not seem to experience earnings growth as their tenure of U.S. residence increases. In summary, the findings suggest that selective migration is an important determinant of earnings differences between U.S.-born black women and black women from the Caribbean.