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Registros recuperados: 9
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Ginkgo biloba Effects on Mice Fetal Liver International Journal of Morphology
Zehra,Uruj; Tahir,Mohammad; Jaffery,Fahim H; Lone,Khalid P.
Ginkgo biloba is considered to be an alternative drug for various indications; unfortunately very few studies are available on its side effects. This present study describes the harmful effects of Ginkgo biloba on developing fetal liver. Two experimental groups of six pregnant female mice each were given Ginkgo biloba at human therapeutic dose (A) and a higher dose (B) throughout the gestation period. A third group (C) was taken as a control and given distilled water only. Fetal livers were examined and the effects of the drug observed. There were signs of congestion and fatty change along with dilatation of sinusoids in a dose dependent manner concluding that Ginkgo biloba affects fetal liver.
Tipo: Journal article Palavras-chave: Ginkgo biloba; Fetal liver; Congestion; Fatty change; Histology.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300017
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Estimating Equilibrium Models of Sorting Across Locations AgEcon
Bayer, Patrick; Timmins, Christopher.
With the growing recognition of the role played by geography in all sorts of economic problems, there is strong interest in measuring the size and scope of local spillovers (i.e., simple anonymous agglomeration or congestion effects, or more complicated interactions between individuals or firms of specific types). It is well-understood, however, that such spillovers cannot be distinguished from unobservable local attributes using just the observed location decisions of individuals or firms. We propose an empirical strategy for recovering estimates of spillovers in the presence of unobserved local attributes for a broadly applicable class of equilibrium sorting models. This approach relies on an instrumental variables strategy derived from the internal...
Tipo: Working or Discussion Paper Palavras-chave: Local spillovers; Location choice; Economic geography; Natural advantage; Social interactions; Network effects; Endogenous sorting; Discrete choice models; Agglomeration; Congestion; Institutional and Behavioral Economics; H7; R0; R2; R3.
Ano: 2003 URL: http://purl.umn.edu/28448
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Does Britain or the United States Have the Right Gasoline Tax? AgEcon
Parry, Ian W.H.; Small, Kenneth A..
This paper develops an analytical framework for assessing the second-best optimal level of gasoline taxation taking into account unpriced pollution, congestion, and accident externalities, and interactions with the broader fiscal system. We provide calculations of the optimal taxes for the US and the UK under a wide variety of parameter scenarios, with the gasoline tax substituting for a distorting tax on labor income. Under our central parameter values, the second-best optimal gasoline tax is $1.01/gal for the US and $1.34/gal for the UK. These values are moderately sensitive to alternative parameter assumptions. The congestion externality is the largest component in both nations, and the higher optimal tax for the UK is due mainly to a higher assumed...
Tipo: Working or Discussion Paper Palavras-chave: Gasoline tax; Pollution; Congestion; Accidents; Fiscal interactions; Public Economics; H21; H23; R48.
Ano: 2004 URL: http://purl.umn.edu/10461
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A Global Game with Strategic Substitutes and Complements AgEcon
Karp, Larry S.; Lee, In Ho; Mason, Robin.
We study a global game in which actions are strategic complements over some region and strategic substitutes over another region. An agent’s payoff depends on a market fundamental and the actions of other agents. If the degree of congestion is sufficiently large, agents’ strategies are non-monotonic in their signal about the market fundamental. In this case, a signal that makes them believe that the market fundamental is more favorable for an action may make them less likely to take the action, because of the risk of overcrowding.
Tipo: Working or Discussion Paper Palavras-chave: Global games; Congestion; Coordination problem; International Relations/Trade; C79; D84.
Ano: 2003 URL: http://purl.umn.edu/25014
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The Effect of Spillovers and Congestion on the Segregative Properties of Endogenous Jurisdiction Structure Formation AgEcon
Oddou, Remy.
This paper analyzes the effect of spillovers and congestion of local public goods on the segregative properties of endogenous formation of jurisdiction. Households living in the same place form a jurisdiction and produce a local public good, that creates positive spillovers in other jurisdictions and suffers from congestion. In every jurisdiction, the production of the local public good is financed through a local tax on household's wealth. Local wealth tax rates are democratically determined in all jurisdictions. Households also consume housing in their jurisdiction. Any household is free to leave its jurisdiction for another one that would increase its utility. A necessary and sufficient condition to have every stable jurisdiction structure segregated by...
Tipo: Working or Discussion Paper Palavras-chave: Jurisdictions; Segregation; Spillovers; Congestion; Environmental Economics and Policy; C78; D02; H73; R13.
Ano: 2011 URL: http://purl.umn.edu/108259
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Overcoming Public Aversion to Congestion Pricing AgEcon
Harrington, Winston; Krupnick, Alan J.; Alberini, Anna.
Transportation authorities have consistently failed to employ economic incentives on major roadways--i.e. time-of-day pricing or "congestion fees"--to internalize the costs of congestion. In principle at least, such tolls can easily be shown to increase social welfare by making motorists pay something closer to the full social costs of their driving decisions. In addition, recent advances in electronics make it possible to implement such fees fairly cheaply and non-intrusively. While these same authorities generally understand and acknowledge the case for using congestion fees, they also claim that their use is politically infeasible because too many motorists would suffer large increases in commuting costs. This is the puzzle: If congestion tolls truly do...
Tipo: Working or Discussion Paper Palavras-chave: Congestion; HOT lanes; Freeways; Time-of-day pricing; Public Economics; R41.
Ano: 1998 URL: http://purl.umn.edu/10730
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A Note on the Equilibrium Properties of Locational Sorting Models AgEcon
Bayer, Patrick; Timmins, Christopher.
A central feature of many models of location choice – whether of firms or households, within or across cities – is the role of local interactions or spillovers, whereby the payoffs from choosing a location depend in part on the number or attributes of other individuals or firms that choose the same or nearby locations in equilibrium. The main goal of this paper is to develop the equilibrium properties of a broadly applicable and readily estimable class of sorting models that allow the location decision to depend on both fixed local attributes (including unobserved attributes) and such local interactions. In particular, we prove uniqueness in the case of congestion effects and use a series of simulations to demonstrate that a unique equilibrium is more...
Tipo: Working or Discussion Paper Palavras-chave: Local spillovers; Social interactions; Economic geography; Natural advantage; Endogenous sorting; Discrete choice models; Agglomeration; Congestion; Random utility; Industrial Organization; H0; R0; R2; R3.
Ano: 2003 URL: http://purl.umn.edu/28378
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Dynamics of Heterogeneous Congestion Tolerance in the Location Choices of U.S. Gulf of Mexico Shrimp Fishermen AgEcon
Ran, Tao; Keithly, Walter R., Jr.; Kazmierczak, Richard F., Jr..
Location choice is one of the most important short-run decisions made by commercial fishermen. Previous studies of location choice by commercial fishermen have focused primarily on site fidelity, profit-maximization behavior, and risk attitudes as factors influencing their location choice behavior. Although the recreational literature gives extensive consideration to the influence of congestion on site selection, few studies have considered the influence of congestion tolerance on site selection in the commercial fishing sector. This study uses a mixed logit model to analyze the heterogeneous congestion tolerance in location choice among U.S. Gulf of Mexico shrimp fishermen. The dynamics of fishermen responses to economic conditions are compared and...
Tipo: Conference Paper or Presentation Palavras-chave: Location choice; Congestion; Mixed logit; Shrimp fishery; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/49213
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Modeling Recreational Amenities in an Urban Setting: Location, Congestion, and Substitution Effects AgEcon
Homans, Frances R.; Marshall, Elizabeth P..
In this article, we introduce a recreational amenity—a greenbelt park—into a simple urban economic model. For multiple possible park placements, we solve for the associated equilibrium urban structure, including the equilibrium rent gradient, city boundary, total number of park visits, the overall utility level, and total vehicle miles traveled. We examine how these change with alternative park placement sites. We then show how two modifications of the basic model—allowing congestion at the site to affect site quality, and introducing the possibility of a substitute site at the city’s periphery—affect our conclusions about how greenbelt location influences urban structure.
Tipo: Journal Article Palavras-chave: Urban structure; Greenbelt; Congestion; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008 URL: http://purl.umn.edu/45670
Registros recuperados: 9
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