International cartel enforcement : lessons from the 1990s

The enforcement record of the 1990s shows that private international cartels are not defunct--nor do they always fall quickly under the weight of their own incentive problems. Of a sample of 40 such cartels prosecuted by the United States and the European Union in the 1990s, 24 lasted at least four years. And for the 20 cartels in this sample where sales data are available, the annual worldwide turnover in affected products exceeded $30 billion. National competition policies address harm in domestic markets, and in some cases prohibit cartels without taking strong enforcement measures. The authors propose a series of reforms to national policies and steps to enhance international cooperation that will strengthen the deterrents against international cartelization. Furthermore, the authors argue that aggressive prosecution of cartels must be complemented by vigilance in other areas of competition policy. If not, firms will respond to the enhanced deterrents to cartelization by merging or by taking other measures that lessen competitive pressures.Legal Products,Environmental Economics&Policies,Microfinance,Economic Theory&Research,Small Scale Enterprise,Environmental Economics&Policies,Economic Theory&Research,Legal Products,Microfinance,Private Participation in Infrastructure

International Cartel Enforcement: Lessons from the 1990s

The enforcement record of the 1990s has demonstrated that private international cartels are neither relics of the past nor do they always fall quickly under the weight of their own incentive problems. Of a sample of forty such cartels prosecuted by the United States and European Union in the 1990s, twenty-four lasted at least four years. And for the twenty cartels in this sample where sales data are available, the annual worldwide turnover in the affected products exceeded US$30billion. Prevailing national competition policies are oriented towards addressing harm done in domestic markets, and in some cases merely prohibit cartels without taking strong enforcement measures. In this paper we propose a series of reforms to national policies and steps to enhance international cooperation that will strengthen the deterrents against international cartelization. Furthermore, aggressive prosecution of cartels must be complemented by vigilance in other areas of competition policy. If not, firms will respond to the enhanced deterrents to cartelization by merging or by taking other measures that lessen competitive pressures.

Introduction to the PEERS Data Hub – A Platform Serving the STEM Research Community

Presentation to NSF EHR Core Research PI conference, November 30-December 1, 2020Presentation to NSF EHR Core Research PI conference, November 30-December 1, 2020National Science Foundation grant numbers 1937509 (ICPSR) and 1937612 (AERA).http://deepblue.lib.umich.edu/bitstream/2027.42/163534/1/PEERS Hub_ECR12-1-2020.pdfSEL

On Approximately Symmetric Informationally Complete Positive Operator-Valued Measures and Related Systems of Quantum States

We address the problem of constructing positive operator-valued measures (POVMs) in finite dimension $n$ consisting of $n^2$ operators of rank one which have an inner product close to uniform. This is motivated by the related question of constructing symmetric informationally complete POVMs (SIC-POVMs) for which the inner products are perfectly uniform. However, SIC-POVMs are notoriously hard to construct and despite some success of constructing them numerically, there is no analytic construction known. We present two constructions of approximate versions of SIC-POVMs, where a small deviation from uniformity of the inner products is allowed. The first construction is based on selecting vectors from a maximal collection of mutually unbiased bases and works whenever the dimension of the system is a prime power. The second construction is based on perturbing the matrix elements of a subset of mutually unbiased bases. Moreover, we construct vector systems in \C^n which are almost orthogonal and which might turn out to be useful for quantum computation. Our constructions are based on results of analytic number theory.Comment: 29 pages, LaTe

Ptychographic X-ray tomography reveals additive zoning in nanocomposite single crystals

Single crystals containing nanoparticles represent a unique class of nanocomposites whose properties are defined by both their compositions and the structural organization of the dispersed phase in the crystalline host. Yet, there is still a poor understanding of the relationship between the synthesis conditions and the structures of these materials. Here ptychographic X-ray computed tomography is used to visualize the three-dimensional structures of two nanocomposite crystals – single crystals of calcite occluding diblock copolymer worms and vesicles. This provides unique information about the distribution of the copolymer nano-objects within entire, micron-sized crystals with nanometer spatial resolution and reveals how occlusion is governed by factors including the supersaturation and calcium concentration. Both nanocomposite crystals are seen to exhibit zoning effects that are governed by the solution composition and interactions of the additives with specific steps on the crystal surface. Additionally, the size and shape of the occluded vesicles varies according to their location within the crystal, and therefore the solution composition at the time of occlusion. This work contributes to our understanding of the factors that govern nanoparticle occlusion within crystalline materials, where this will ultimately inform the design of next generation nanocomposite materials with specific structure/property relationships

Repeated unilateral handgrip contractions alter functional connectivity and improve contralateral limb response times

In humans, motor learning is underpinned by changes in sensorimotor network functional connectivity (FC). Unilateral contractions increase FC in the ipsilateral primary motor cortex (M1) and supplementary motor area (SMA); areas involved in motor planning and execution of the contralateral hand. Therefore, unilateral contractions are a promising approach to augment motor performance in the contralateral hand. In a within-participant, randomized, cross-over design, 15 right-handed adults had two magnetic resonance imaging (MRI) sessions, where functional-MRI and MR-Spectroscopic Imaging were acquired before and after repeated right-hand contractions at either 5% or 50% maximum voluntary contraction (MVC). Before and after scanning, response times (RTs) were determined in both hands. Nine minutes of 50% MVC contractions resulted in decreased handgrip force in the contracting hand, and decreased RTs and increased handgrip force in the contralateral hand. This improved motor performance in the contralateral hand was supported by significant neural changes: increased FC between SMA-SMA and increased FC between right M1 and right Orbitofrontal Cortex. At a neurochemical level, the degree of GABA decline in left M1, left and right SMA correlated with subsequent behavioural improvements in the left-hand. These results support the use of repeated handgrip contractions as a potential modality for improving motor performance in the contralateral hand

3D Visualisation of Additive Occlusion and Tunable Full-Spectrum Fluorescence in Calcite

From biomineralization to synthesis, organic additives provide an effective means of controlling crystallisation processes. There is growing evidence that these additives are often occluded within the crystal lattice, where this promises an elegant means of creating nanocomposites and tuning physical properties. Here, we use the incorporation of sulfonated fluorescent dyes to gain new understanding of additive occlusion in calcite (CaCO3), and to link morphological changes to occlusion mechanisms. We demonstrate that these additives are incorporated within specific zones, as defined by the growth conditions, and show how occlusion can govern changes in crystal shape. Fluorescence spectroscopy and lifetime imaging microscopy also show that the dyes experience unique local environments within different zones. Our strategy was then extended to simultaneously incorporate mixtures of dyes, whose fluorescence cascade creates calcite nanoparticles that fluoresce white. This offers a simple strategy for generating biocompatible and stable fluorescent nanoparticles whose output can be tuned as required