Treatment effect bounds: An application to Swan–Ganz catheterization

We reanalyze data from the observational study by Connors et al. (1996) on the impact of Swan–Ganz catheterization on mortality outcomes. The study by Connors et al. (1996) assumes that there are no unobserved differences between patients who are catheterized and patients who are not catheterized and finds that catheterization increases patient mortality. We instead allow for such differences between patients by implementing both the instrumental variable bounds of Manski (1990), which only exploits an instrumental variable, and the bounds of Shaikh and Vytlacil (2011), which exploit mild nonparametric, structural assumptions in addition to an instrumental variable. We propose and justify the use of indicators of weekday admission as an instrument for catheterization in this context. We find that in our application, the Manski (1990) bounds do not indicate whether catheterization increases or decreases mortality, where as the Shaikh and Vytlacil (2011) bounds reveal that at least for some diagnoses, Swan–Ganz catheterization reduces mortality at 7 days after catheterization. We show that the bounds of Shaikh and Vytlacil (2011) remain valid under even weaker assumptions than those described in Shaikh and Vytlacil (2011). We also extend the analysis to exploit a further nonparametric, structural assumption–that doctors catheterize individuals with systematically worse latent health–and find that this assumption further narrows these bounds and strengthens our conclusions. In our analysis, we construct confidence regions using the methodology developed in Romano and Shaikh (2008). We show in particular that the confidence regions are uniformly consistent in level over a large class of possible distributions for the observed data that include distributions where the instrument is arbitrarily “weak”.     

Foreign capital inflows and economic growth of Pakistan

This study investigates the relationship of foreign capital inflows, namely foreign direct investment, workers’ remittances, and external debt with economic growth of Pakistan by employing time series data from 1976 to 2015. Cointegration results indicate that foreign capital inflows and economic growth have a significant relationship with economic growth in the long run. Ordinary least square results indicate foreign direct investment has a significant and negative effect on economic growth, whereas a significant positive effect of remittances and external debts on economic growth is found. Rolling windows analysis highlights the yearly effect of three different models. Two different sensitivity analyses confirmed that initial results are robust. The final section concludes the study and provides some policy implications.     

Are Agricultural Values a Reliable Guide in Determining Landowners' Decisions to Create Forest Carbon Sinks?

This research examines the effects of various factors on farmer participation in agricultural tree plantations for economic, environmental, social, and carbon‐uptake purposes, and potential costs of sequestering carbon through afforestation in western Canada. Using data from a survey of landowners, a discrete choice random utility model is used to determine the probability of landowners' participation in and corresponding mean willingness to accept (WTA) compensation for a tree‐planting program. WTA includes positive and negative benefits to landowners from planting trees, benefits not captured by foregone returns from agricultural activities on marginal land. Estimates of WTA are less than foregone returns, but even so average costs of creating carbon credits still exceed their projected value under a CO₂‐emissions trading scheme. La présente étude a examiné les effets de divers facteurs sur la participation des producteurs agricoles à la plantation d'arbres à des fins économiques, environnementales, sociales et d'absorption du gaz carbonique, ainsi que les coûts potentiels de la séquestration du carbone au moyen du boisement dans l'Ouest canadien. À l'aide des données d'un sondage effectué auprès de propriétaires fonciers, nous avons utilisé un modèle d'utilité aléatoire à choix discrets pour déterminer la probabilité de participation des propriétaires fonciers à un programme de boisement et leur consentement à recevoir (CAR) une compensation financière pour leur participation. Le CAR inclut les avantages favorables et défavorables que le boisement procure aux propriétaires fonciers, des avantages non saisis par les revenus sacrifiés des activités agricoles sur des terres marginales. Les estimations du CAR sont inférieures aux revenus sacrifiés, mais malgré tout, les coûts moyens de la mise en uvre de programme de crédits pour le carbone demeurent supérieurs à leur valeur prévue dans un scénario d'échange de droits d'émission de CO₂.     

Defying Distance? Cross‐Border Acquisitions by Emerging‐Economy Firms

We argue that emerging‐economy firms’ international location choices are driven by the pursuit of dynamic efficiency rather than the immediate minimization of transaction and learning costs, and hence the relationship between country distance and the number of cross‐border acquisitions will be less negative for these firms relative to advanced‐economy firms. We then test the hypothesis with respect to four measures of country distance—geographic, economic, cultural, and institutional—and find support for the hypothesis. Our study provides empirical support for claims in the literature about differences in the international expansion behavior of emerging‐economy firms with respect to location. In addition, our study makes a theoretical contribution by showing that the theoretical perspective of dynamic efficiency can explain the difference in the location choices for cross‐border acquisitions by emerging‐economy firms relative to those by advanced‐economy firms. © 2016 Wiley Periodicals, Inc..     

Diffusion of Kyoto's clean development mechanism

To date, developed countries can only tap mitigation opportunities in developing countries by investing in projects under the Clean Development Mechanism (CDM). Yet CDM investments have so far failed to reach all of the high-potential sectors identified in IPCC reports. This raises doubts about whether the CDM will be able to generate an adequate supply of credits from the limited areas where it has proved successful. Our paper examines the current trajectory of potential mitigation entering the CDM pipeline and projects it forward under the assumption that the diffusion of the CDM will follow a path similar to other kinds of innovations. Projections are then compared to pre-CDM predictions of the mechanism's potential market size used to assess Kyoto's cost, in order to discern whether limits on the types of project entering the pipeline will also limit the eventual supply of certified emission reductions (CERs). The main finding of the paper is that the mechanism is on track to deliver an average annual flow of roughly 700 million CERs by the close of 2012 and nearly to 1100 million tons by 2020. Parameter tests suggest that currently identified CDM investments will exceed early model predictions of the potential market for CDM projects.