The Case of the Missing Pollution Haven Hypothesis

One particularly vexing puzzle for economists and policymakers over the past several decades concerns the empirical significance of the theoretically predicted pollution haven hypothesis. While neoclassical theory and conventional wisdom both surmise that local economies will suffer deleterious effects from stricter environmental regulations, empirical studies have largely failed to validate such claims. This study utilizes the method of matching to show that the impact of stricter regulation is heterogeneous spatially, varying systematically based on location-specific attributes. Previous studies that assume a homogenous response may therefore inadvertently mask the overall impact of more stringent regulations by pooling unaffected and affected regions. Copyright Kluwer Academic Publishers 2004pollution haven hypothesis, environmental regulation, treatment effects, propensity score, matching,

Nuclear charge radii of neutron-deficient lead isotopes beyond N=104 midshell investigated by in-source laser spectroscopy

The shape of exotic even-mass $^{182–190}$Pb isotopes was probed by measurement of optical isotope shifts providing mean square charge radii ($\delta$). The experiment was carried out at the isolde (cern) on-line mass separator, using in-source laser spectroscopy. Small deviations from the spherical droplet model are observed, but when compared to model calculations, those are explained by high sensitivity of $\delta$ to beyond mean-field correlations and small admixtures of intruder configurations in the ground state. The data support the predominantly spherical shape of the ground state of the proton-magic Z=82 lead isotopes near neutron midshell (N=104)

Nuclear charge radii of neutron-deficeint lead isotopes beyond N=104 midshell investigated by in-source laser spectroscopy

info:eu-repo/semantics/publishe