high groundwater salinity, a high water table and secondary soil salinization are dominant conditions in eastern isfahan province, iran. this region has a low annual rainfall, high annual evaporation demand, saline soils and limited fresh water supplies. to investigate the effects of irrigation deficit and salinity on cantaloupe (cucumis melo l. var. cantalupensis) production, a field experimen...

We study efficiency and budget balance for designing mechanisms in general quasi-linear domains. Green and Laffont (1979) proved that one cannot generically achieve both. We consider strategyproof budget-balanced mechanisms that are approximately efficient. For deterministic mechanisms, we show that a strategyproof and budget-balanced mechanism must have a sink agent whose valuation function is...

Knowledge of the structure of production in public-utility enterprises is of considerable economic importance. Such things as the nature and extent of returns to scale and returns to individual factor imputs, the degree of substitutability between inputs, and the extent of allocative inefficiency and X-inefficiency may have bearings on various issues at the plant, firm and industry levels. For ...

We study efficiency and budget balance for designing mechanisms in general quasi-linear domains. Green and Laffont [13] proved that one cannot generically achieve both. We consider strategyproof budgetbalanced mechanisms that are approximately efficient. For deterministic mechanisms, we show that a strategyproof and budget-balanced mechanism must have a sink agent whose valuation function is ig...

The aim of this work is to introduce a new econometric methodology for multioutput production frontiers. In the context of a system of frontier equations, we use a flexible multivariate distribution for the inefficiency error term. This multivariate distribution is constructed through a copula function which allows for separate modelling of the marginal inefficiency distributions and the depend...

We discuss an environmental Luenberger–Hicks–Moorsteen (LHM) total factor productivity (TFP) indicator and its decomposition that incorporates a negative externality into the measurement of economic performance. Special cases generalized directional distance function are involved in definition this LHM proposed decomposition. also seek to test whether changes convexity assumption ...

Using the self-selection approach to tax analysis within an OLG framework, the paper examines optimal non-linear labour and capital income taxation and the provision of a durable public good. Under endogenous wages, the marginal tax rules depend on the influence of the tax instruments on self-selection and on the income earning abilities of the households. In particular, we found that productio...

bacteriophage is a kind of virus that infect bacteria, and is distinct from the animal and plant viruses that could have either lytic or lysogenic cycle. lytic phages known as candidates for phage therapy, since they rapidly replicate into their host and lyse them. theoretically, phages have more than a few benefits over routine antibiotics. they are extremely specific and for their targeted ho...