نتایج جستجو برای: q30

تعداد نتایج: 79  

2008
Gunter Bahr Till Requate

Experimental evidence indicates that non-monetary considerations influence subjects’ allocation behavior. We investigate the impact of a multigeneration setup on allocation behavior. We modify the traditional dictator game by introducing 3 generations A, B and C. A takes an arbitrary share of a pie and passes the rest to B. B divides the rest of the pie between her and C. We find that this inte...

2009
Christian Traeger Larry Karp

We derive a general framework for cost-benefit analysis and social discounting in a setting with intertemporally dependent preferences. Here, the marginal contribution of an additional unit of consumption in some period depends on what is consumed in the other periods. We use a simple model of history dependent preferences to analyze how habit formation affects the social rate of discount. Gett...

2009
Matti Liski Juan-Pablo Montero

It has been long recognized that an exhaustible-resource monopsonist faces a commitment problem similar to that of a durable-good monopolist. Indeed, Hörner and Kamien (2004) demonstrate that the two problems are formally equivalent under full commitment. We show that there is no such equivalence in the absence of commitment. The existence of a choke price at which the monopsonist adopts the su...

2011
Matti Liski Juan-Pablo Montero

The exhaustible-resource monopsony problem provides a basis for understanding the dynamic relationship between resource importers and suppliers. We find that the mere presence of a substitute supply creates a time-inconsistency problem for the monopsonist. When the buyer can commit to delaying the arrival of the substitute, he obtains a substantial reduction in resource prices but not enough as...

2000
Amitrajeet A. Batabyal

Although ecologists have long recognized the salience of persistence in determining the static and the dynamic behavior of ecological systems, it is only very recently that economists have begun to study this concept in relation to the use of services that are provided by jointly determined ecological-economic systems (ecosystems). As such, there are very few studies of ecosystems that explicit...

2005
M. A. Adelman G. C. Watkins

A time series is estimated of in-ground prices of U.S. oil and natural gas reserve prices for the period 1982–2003, usingmarket transaction data. Reserves sold are considered as proved; errors in this respectmay affect estimates, in either direction. The data are also used to examine the impact of reserve status, production rate, andwell head prices, on reserve prices. Both oil and gas current ...

2008
Alfred Greiner Willi Semmler

In this paper we present empirical facts on oil exploitation and a model that can replicate some of these facts. In particular, we show that the time path of the oil price, on the one hand, and the extraction and discovery rate, on the other hand, seem to follow a U-shaped and an inverted U-shaped relationship, respectively, which is confirmed by simple non-parametric estimations. Next, we pres...

ژورنال: علوم آب و خاک 2021

Wind erosion is one of the environmental problems worldwide, particularly in arid and semi-arid areas of Iran. Different methods and models have been proposed to measure and monitor wind erosion in the recent years. One of the accurate models for measuring f wind erosion is the USEPA model. The purpose of this study was to evaluate the quantification of wind erosion with the USEPA model and the...

ژورنال: :علوم اقتصادی 2015
حمید آماده فرشید عفتی باران امین امینی

یکی از روش­های مناسب در پیش­بینی سری زمانی، تعمیم رفتار گذشته سری به آینده است. برای این منظور اولین قدم شناخت دقیق رفتار گذشته متغیر است. یکی از روش­های الگوسازی رفتار گذشته سری زمانی مدل خود توضیح جمعی میانگین متحرک (arima) است. در این پژوهش از مدل های arima و arfima برای پیش­بینی قیمت هفتگی بنزین استفاده شد. همچنین پیش­بینی مدل arima با پیش بینی مدل خود توضیح کسری جمعی میانگین متحرک (arfima)...

ژورنال: :فصلنامه علمی - پژوهشی مدلسازی اقتصادی 2015
مسعود صوفی مجیدپور مهدی پورمهر

چکیده نفت خام به عنوان یکی از منابع مهم تولید، با دارا بودن مشتقات فراوان، نقش مهمی در ساز و کار اقتصاد کشورهای جهان دارد. از این رو، تغییر قیمت نفت، تاثیر زیادی بر تغییر قیمت دیگر کالاها و خدمات دارد. این مقاله تغییرات قیمت جهانی نفت را از طریق شاخص قیمت واردات بر شاخص قیمت کالاها و خدمات داخلی با استفاده از الگوی خودتوضیح برداری و داده های سال های 1980-2014 به همراه جدول داده- ستانده سال 138...

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