1. Global declines in biodiversity have stimulated much research into the consequences of species loss for ecosystems and the goods and services they provide. Species at higher trophic levels are at greater risk of human-induced extinction yet remarkably little is known about the effects of consumer species loss across multiple trophic levels in natural complex ecosystems. Previous studies have...

abstract main objective of this paper is the investigation the effect of support policies of government on income risk of poultry producers in iran for the 1989-2006. ccv index was used to investigate amount of variation that cause each support policies (market price support, support of agricultural inputs, outputs insurance) on income risk variation of producers. the results of this study show...

abstract barberry is one of the most important products of south khorasan province. the objective of this study is analyzing the qualitative factors affecting the price of barberry in this province. survey data from 100 questionnaires using simple random sampling of households in the city of birjand, 1389 has been completed, was extracted. results of the estimating hedonic price model show that...

The food chain refers to a natural system by which energy is transmitted from one organism to another. In fact, a food chain consists of producers, consumers and decomposition. Presence of complex food web increase the stability of the ecosystem. Classical food chain theory arises from Lotka-Volterra model. In the present paper, the dynamics behavior of three level food chain is studied. A syst...

The paper presents the articulated strategy of valorization, implemented by the international movement called Slow Food in Italy and abroad in order to reconsider the concept of agricultural profitability. In particular, the paper suggests profitability lays on the value markets recognize to agricultural production. In this perspective, the Slow Food strategy represents a good practice to be em...

This study aims to segment the market based on demographical, psychological, and behavioral variables, and seeks to investigate their relationship with green consumer behavior. In this research, self-organizing maps are used to segment and to determine the features of green consumer behavior. This was a survey type of research study in which eight variables were selected from the demographical,...

Leveraged by the advances in communication and information Technologies, producers and consumers are developing a new behavior. Together with the new emerging collaborative manifestations this behavior may directly impact the way products are developed. This powerful combination indicates that consumers will be involved in a very early stage in product development processes supporting even more...

We present a model of the behavior of an industry in perfect competition. A new feature in the modeling is the consumers’ role in the evolution of the industry. We show a link in between market behavior and economic growth at industry level. Growth may occur due to increases in technology or consumers’ wealth, due to a positive change in consumers’ preferences concerning this good or increasing...