Most of the time, economists take into account non market relationships rationality by the way of externality concept or extensions of capital category ; As a result of recent researches in the field of agriculture and environment, we are suggesting to take an other way. It consists of...

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[eng] According to the traditionnal economic theory, landlord would be a rentier stranger to the farm, while the leaseholder should be considered to be an entrepreneur. This picture misleads. Land proprietor influences the definition of the farm ; he supervises its functionning and investments....