A Growing Hole in the Safety Net: Physician Charity Care Declines Again

Examines reasons for the decline in the number of physicians providing free or reduced cost health care in proportion to the number of uninsured Americans, in the last decade. Includes implications related to the decline in access to medical care

Fast solution of Cahn-Hilliard variational inequalities using implicit time discretization and finite elements

We consider the e�cient solution of the Cahn-Hilliard variational inequality using an implicit time discretization, which is formulated as an optimal control problem with pointwise constraints on the control. By applying a semi-smooth Newton method combined with a Moreau-Yosida regularization technique for handling the control constraints we show superlinear convergence in function space. At the heart of this method lies the solution of large and sparse linear systems for which we propose the use of preconditioned Krylov subspace solvers using an e�ective Schur complement approximation. Numerical results illustrate the competitiveness of this approach

In China's Wake: Has Asia Gained From China's Growth?

China’s growth has been rapid but the value of China's international trade has grown even faster. This trade-biased growth is bringing both challenges and opportunities for Asian economies that are highly integrated with Chinese trade networks. Moreover in ASEAN countries such as Indonesia and Malaysia, China’s success has been seen as a threat to its existing trade and manufacturing base. We use an historical simulation analysis to examine the impacts of China’s growth on Asian economies. We find that a decade of China’s growth has raised GDP per capita in the developed Asian economies by around 16%. The effect on the ASEAN-4 economies is not as strong but still large, the GDP of the ASEAN-4 economies increased by approximately 7%. The main source of these gains is found to be lower durable goods import costs which induce accumulation of machinery and equipment capital.Economic Growth, China, Trade Costs

A shared agenda for the Seoul Conference on Cyberspace, South Korea, 2013

This briefing is ASPI’s distillation of the thoughts of a group of prominent members of the Australian cybersecurity community. We held a workshop in Canberra on the key panel sessions that will take place at the Seoul Conference on Cyberspace, South Korea, in October 2013. Workshop participants included the Australian Government departments with a stake in cyber issues and members of the private sector, including the banking and IT sectors, defence and security industries and representatives from the wider business community. The aim of the workshop was to provide creative Australian perspectives to take to the Seoul conference

Emission line ratios for the Circumgalactic Medium and the "Bimodal" Nature of Galaxies

We find significantly different diagnostic emission line ratios for the circumgalactic gas associated with galaxies of stellar masses above and below $10^{10.4}$ M$_\odot$ using SDSS spectroscopy. Specifically, in a sample of 17,393 galaxies, intersected by 18,535 lines of sight at projected radii between 10 and 50 kpc, we stack measured fluxes for nebular strong emission lines, [O {\small III}] $\lambda$5007, H$\alpha$ and [N {\small II}] $\lambda6583$, and find that the gas surrounding the lower mass galaxies exhibits similar line ratios to those of gas ionized by star formation and that surrounding the higher mass galaxies similar to those of gas ionized by AGN or shocks. This finding highlights yet another characteristic of galaxies that is distinctly different above and below this stellar mass threshold, but one that is more closely connected to the gas accretion behavior hypothesized to be responsible for this dichotomy.Comment: 5 pages, 3 figures, accepted by ApJ

Charity Auctions: A Field Experimental Investigation

Auctions are a popular way to raise money for charities, but relatively little is known, either theoretically or empirically, about the properties of charity auctions. The small theoretical literature suggests that the all-pay auction should garner more money than winner-pay auctions. We conduct field experiments to test which sealed bid format, first price, second price or all-pay raises the most money. Our experiment suggests that both the all-pay and second price formats are dominated by the first price auction. Our design also allows us to identify differential participation as the source of the difference between existing theory and the field. To conclude, we show that a model of charity auctions augmented by an endogenous participation decision predicts the revenue ordering that we see in the field.

Endogenous Participation in Charity Auctions

Data from a recent ?eld experiment suggests that differences in participation rates are responsible for much of the variations in revenues across formats in charity auctions. We provide a theoretical framework for the analysis of this, and other related, results. The model illustrates the limits of previous "?xed" results and introduces some new considerations to the choice of auction mechanism. It also implies, however, that the data cannot be explained in terms of participation costs alone: there must exist mechanism-speci?c obstacles to participation.