37,089 research outputs found
Bioenergy and agriculture: promises and challenges
Peter Hazell.Biofuels, Agricultural research, Development, Poor Developing countries,
Gaussian density fluctuations, mode coupling theory, and all that
We consider a toy model for glassy dynamics of colloidal suspensions: a
single Brownian particle diffusing among immobile obstacles. If Gaussian
factorization of static density fluctuations is assumed, this model can be
solved without factorization approximation for any dynamic correlation
function. The solution differs from that obtained from the ideal mode coupling
theory (MCT). The latter is equivalent to including only some, positive
definite terms in an expression for the memory function. An approximate
re-summation of the complete expression suggests that, under the assumption of
Gaussian factorization of static fluctuations, mobile particle's motion is
always diffusive. In contrast, MCT predicts that the mobile particle becomes
localized at a high enough obstacle density. We discuss the implications of
these results for models for glassy dynamics.Comment: to be published in Europhys. Let
Financing medical specialist services in the Netherlands; welfare implications of imperfect agency
From 1995 onward the financing scheme for specialist care in the Netherlands has moved from a fee-for-service scheme to a lump-sum budget scheme. This paper analyses the economic and welfare effects of this policy change. The paper adopts a model that integrates demand and supply considerations and recognizes the potential roles of moral hazard and supplier-induced demand. The model is fully numerical, being estimated and calibrated upon data for the Dutch health care sector. The paper finds that the shift in financing regime has been welfare-reducing. The policy change induced medical specialists to lower the supply of health services which was already too low from a welfare point of view. This conclusion is robust to significant changes in major parameter values.
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