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The Department of Environmental Economics and Management

The Robert H. Smith Faculty
of Agriculture, Food and Environment
The Hebrew University of Jerusalem

PO Box 12, Rehovot 76100
Fax: 08-9466267

Department Head:
Prof. Ayal Kimhi, Tel: 08-9489376

Head of the teaching program:

Dr. Iddo Kan, Tel: 08-9489233

Miri Arazi, Tel: 08-9489230


Bar-Nahum, Z. ; Finkelshtain, I. ; Ihle, R. ; Rubin, O. D. Effects of violent political conflict on the supply, demand and fragmentation of fresh food markets. 2020, 12, 503 - 515. Publisher's VersionAbstract
Violent political conflict has been documented to have comprehensive adverse effects on economic activity and, thus, substantially harm social welfare. As conflict escalations are often reported to fragment economic space, we suggest an empirical framework which allows for estimating changes in the size of markets often split by frontlines. This approach uses a differentiated goods oligopoly model to separate effects of conflict intensity on consumer demand, costs of trade, market size, and market structure. We combine daily sales of apples in Hebron - one of the focal points of the Israeli–Palestinian conflict - and variables quantifying complementary aspects of conflict intensity. Conflict is found to suppress demand and affect competition more significantly than it increases costs of trading. Simulations indicate a 15% reduction in total daily consumption during conflict of high intensity while a pacification would yield a 20% welfare gain. This empirical framework allows disentangling the effects of conflict on food markets. The results suggest that relief policies should consider alleviating effects of fragmentation of economic space, e.g., by ensuring humanitarian corridors.
Heiman, A. ; Ferguson, J. ; Zilberman, D. Marketing and Technology Adoption and Diffusion. Applied Economic Perspectives and Policy 2020, 42, 21-30. Publisher's VersionAbstract
Abstract Applied economists have investigated individual adoption choices as well as diffusion (aggregate adoption). The emphasis, however, has been on adopters' behavior and risk associated with production and markets. Marketing also considers broader aspects and marketers develop tools to address risk related to the fit of a product, its performance, and its reliability. This paper expands the economic literature on adoption by analyzing and assessing the implications of the choice of marketing tools, like money-back guarantees, demonstrations, and others, by marketers. The analysis is based on the threshold model of diffusion, which recognizes heterogeneity and dynamics. We provide evidence and examples from agriculture.
Raveh, O. Monetary Policy, Natural Resources, and Federal Redistribution. Environmental and Resource Economics 2020, 75, 585-613. Publisher's VersionAbstract
Can monetary policy shocks induce redistribution across natural resource rich and poor states within a federation? We conjecture that resource-rich states are capital intensive, hence their investment is more responsive to changes in monetary policy. Consequently, contractionary monetary policy shocks (e.g., increases in the interest rate) may induce redistribution from resource-poor states to resource-rich ones, via an equalizing federal transfer scheme, because investment is reduced more strongly in the latter. We test these hypotheses using a panel of U.S. states covering several decades, and find that: (1) resource-rich states are significantly and persistently more capital intensive; (2) contractionary monetary policy shocks induce a relative drop (increase) in investment (federal transfers) in resource-rich states, over the course of four years; (3) these patterns are driven by resource-induced differences in the capital share in the economy. We estimate that a one standard deviation contractionary monetary shock induces, within the first year, federal redistribution of approximately $$\$2.5$$$2.5 billion from the resource-poor to the resource-rich states, representing about $$11\%$$11% of the total average annual federal transfers received by the latter states.
Ert, E. ; Fleischer, A. What do Airbnb hosts reveal by posting photographs online and how does it affect their perceived trustworthiness?. Psychology & Marketing 2020. Publisher's VersionAbstract
Abstract The use of sellers' personal photographs online is ubiquitous in sharing economy platforms such as Airbnb. This paper addresses two questions. First, what type of personal photos do hosts choose to post on Airbnb? Second, which of the characteristics of their photos affects their perceived trustworthiness? We answer these questions by building a structural equation model of the relation between the characteristics of the photos and the perceived trustworthiness of the hosts. The antecedents of trust in this model were defined based on insights from psychology regarding first impressions. We found that the hosts' visual characteristics (e.g., gender) as revealed in their online photographs affect their perceived trustworthiness both directly and indirectly via attractiveness. We also found that image characteristics, which are not related directly to the traits of the host in the picture (e.g., photograph quality), play a significant role in trust inference. Interestingly, the hosts' choices of their personal photos suggest that they may not be aware of these effects.