Agriculture and climate change in global scenarios: why don't the models agree

Agriculture is unique among economic sectors in the nature of impacts from climate change. The production activity that transforms inputs into agricultural outputs involves direct use of weather inputs (temperature, solar radiation available to the plant, and precipitation). Previous studies of the impacts of climate change on agriculture have reported substantial differences in outcomes such as prices, production, and trade arising from differences in model inputs and model specification. This article presents climate change results and underlying determinants from a model comparison exercise with 10 of the leading global economic models that include significant representation of agriculture. By harmonizing key drivers that include climate change effects, differences in model outcomes were reduced. The particular choice of climate change drivers for this comparison activity results in large and negative productivity effects. All models respond with higher prices. Producer behavior differs by model with some emphasizing area response and others yield response. Demand response is least important. The differences reflect both differences in model specification and perspectives on the future. The results from this study highlight the need to more fully compare the deep model parameters, to generate a call for a combination of econometric and validation studies to narrow the degree of uncertainty and variability in these parameters and to move to Monte Carlo type simulations to better map the contours of economic uncertainty.     

Does marketing and sales integration always pay off? Evidence from a social capital perspective

Building on social capital theory, we view the marketing and sales interface as a set of inter-group ties and investigate how cross-functional relationships may facilitate the development of social capital associated with value creation. Our findings suggest that social capital embedded in marketing and sales relationships can inhibit a firm’s performance depending on the characteristics of its customers. Our results also demonstrate that managing the marketing and sales interface at different levels of customer concentration is critical to the success of a firm’s performance.     

The causes of unemployment in France: a flow approach

A flow model is used to identify the causes for rising unemployment in France between 1978 and 1990. Two flow equations are estimated as functions of exogenous factors such as aggregate demand, factor costs, structural shifts and long-term factors and then used in simulations for the level of unemployment. It is shown that the main reason for high unemployment in France is a slow down in the demand for labour due to high labour and energy costs in the early 1980s and to tight aggregate demand over the whole period.Change in the labour supply have had an increasing impact in recent years.     

The periurban city: why to live between the suburbs and the countryside

The last 30 years have witnessed the emergence of a new pattern of urban development in France, called the periurban belt. It is defined as a belt outside the city occupied both by households and farmers. We develop a residential model in which households commuting to an employment center may choose to live with farmers in this mixed belt because they value the rural amenities created by farming activities. Both types of agents compete on the land market and the equilibrium conditions allow us to obtain an analytical solution and to provide some insights about the robustness of the periurban form against decreases in commuting costs. Finally, the model is calibrated on French data.     

Breaking up the collective farms

The de‐collectivization of Vietnamese agriculture was a crucial step in the country's transition to a market economy. The assignment of land‐use rights had to be decentralized and local cadres ostensibly had the power to capture this process. We assess the realized land allocation against explicit counter‐factuals. Depending on the region, we find that 95–99 percent of maximum aggregate consumption was realized by a land allocation that generated lower inequality overall, with the poorest absolutely better off. We attribute this outcome to initial conditions at the time of reform and actions by the centre to curtail the power of local elites.     

THE SOCIAL EFFICIENCY OF INSTRUMENTS FOR THE PROMOTION OF RENEWABLE ENERGIES IN THE LIBERALISED POWER INDUSTRY

ABSTRACT ** :  This paper compares the social efficiency of the two main regulatory instruments used to promote renewable energy sources in electricity generation (RES-E), taking into consideration their role in promoting the preservation of the climate. They are based on a purchase obligation and act either by price (feed-in tariffs) or by quantity (RES-E quotas). In their reference design, the instruments show different performances in several dimensions: market incentives intensity, control of the cost for consumers, safeguards of RES-E investments, and conformity with the new market regime of the electricity industry. The comparison shows that neither instrument offers an optimal solution in each of these dimensions. In particular, the intrinsic qualities of the quotas instrument that are put forward to mandate its adoption by the EU members are overestimated. A government will thus select an instrument in accordance with the relative importance of its objectives: environmental policy versus cost control by market pressure.     

Travail domestique et espace-temps des femmes

The subject of this article is the division of labour between the sexes which is specific to capitalism, and the characteristics of the space-time of women. On the basis of works written by historians, we are trying to show that the present division of labour which sentences women primarily to domestic work and men to productive work, is linked to the specifically capitalist separation between production and reproduction. The whole sphere of reproduction where specialized institutions such as school or medicine are closely linked to the family, contributes, through the transformations of domestic work, to the establishment of new social relationships: the children are permanent objects of care and education, the women are defined in terms of mother-wives. Those transformations can be seen in those of the space and time of urban structures and housing. Now the space-time of women seems mainly structured by domestic work. Concrete elements underline it: for example the space-time imposed upon women is delimited by a series of prohibitions bearing upon those places and times that do not belong to domestic work. The constitution of this space-time is based upon the negation of women's work within production. Reformulated in terms of mobility, the space-time of women differs according to social classes but its main features stem from the division of labour between the sexes and the status of the mother-wife.