22,979 research outputs found

    Gerechte Designs with Rectangular Regions

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    A \emph{gerechte framework} is a partition of an n×nn \times n array into nn regions of nn cells each. A \emph{realization} of a gerechte framework is a latin square of order nn with the property that when its cells are partitioned by the framework, each region contains exactly one copy of each symbol. A \emph{gerechte design} is a gerechte framework together with a realization. We investigate gerechte frameworks where each region is a rectangle. It seems plausible that all such frameworks have realizations, and we present some progress towards answering this question. In particular, we show that for all positive integers ss and tt, any gerechte framework where each region is either an s×ts \times t rectangle or a t×st\times s rectangle is realizable.Comment: 14 pages, 12 figure

    Free to Squander? Democracy, Institutional Design, and Economic Sustainability, 1975–2000

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    While democracy’s effect on economic growth has come under intense empirical scrutiny, its effect on economic sustainability has been noticeably neglected. We assess the effects of regime type and democratic institutional design on economic, or “weak” sustainability. Sustainability requires that stocks of capital do not depreciate in value over time. The World Bank gauges the rate of net investment in manufactured, human, and natural capital, a unified indicator of weak sustainability (the genuine savings rate). All four indicators of democracy we examine show that freer societies have higher genuine savings rates because they invest more in human capital, create less CO2 damage, and extract fewer natural resources per economic unit produced, even if they show lower net investment in manufactured capital. Democracies may trade off immediate material welfare gains for future pay-offs. This finding justifies why scholars should assess the effects of regime type on more than just immediate growth or the rate of change of manufactured capital. Among democracies, we find that pure parliamentary systems spend more on education than do presidential ones, but exhibit no statistically significant difference for the overall genuine savings rate. Proportional representation electoral systems fare worse than plurality when it comes to genuine and net national savings, even though they do better on education spending. The results taken together show that differences in regime type and democratic institutional design allow for different trade-offs. The results are robust to a range of specifications and a developing country only sub- sample.

    The Effects of Medicaid and Medicare Reforms on the Elderly’s Savings and Medical Expenditures

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    We study a model in which retired single people optimally choose consumption, medical spending and saving while facing uncertainty about their health, lifespan and medical needs. This uncertainty is partially offset by insurance provided by the government and private institutions. We first show how well the model matches important features of the data and we analyze the degree of insurance provided by current programs. We then analyze the effects of some reforms, meant to capture changes in Medicaid and Medicare, on savings and medical expenditures.

    Why do the elderly save? the role of medical expenses

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    This paper constructs a rich model of saving for retired single people. Our framework allows for bequest motives and heterogeneity in medical expenses and life expectancies. We estimate the model using AHEAD data and the method of simulated moments. The data show that out-of-pocket medical expenses rise quickly with both age and permanent income. For many elderly people the risk of living long and requiring expensive medical care is a more important driver of old age saving than the desire to leave bequests. Social insurance programs such as Medicaid rationalize the low asset holdings of the poorest. These government programs, however, also benefit the rich because they insure them against their worst nightmares about their very old age: either not being able to afford the medical care that they need, or being left destitute by huge medical bills.Retirement income ; Medical care, Cost of

    Life expectancy and old age savings

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    Rich people, women, and healthy people live longer. We document that this heterogeneity in life expectancy is large. We use an estimated structural model to assess the impact of life expectancy variation on the elderly’s savings. We find that the differences in life expectancy related to observable factors such as health, gender, and income have large effects on savings, and that these factors contribute by similar amounts. We also show that the risk of outliving one’s expected lifespan has a large effect on the elderly’s saving behavior.Wealth ; Retirement income

    Enabling the Autonomic Management of Federated Identity Providers

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    The autonomic management of federated authorization infrastructures (federations) is seen as a means for improving the monitoring and use of a service provider’s resources. However, federations are comprised of independent management domains with varying scopes of control and data ownership. The focus of this paper is on the autonomic management of federated identity providers by service providers located in other domains, when the identity providers have been diagnosed as the source of abuse. In particular, we describe how an autonomic controller, external to the domain of the identity provider, exercises control over the issuing of privilege attributes. The paper presents a conceptual design and implementation of an effector for an identity provider that is capable of enabling cross-domain autonomic management. The implementation of an effector for a SimpleSAMLphp identity provider is evaluated by demonstrating how an autonomic controller, together with the effector, is capable of responding to malicious abuse
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