Many of the financial and social challenges that face Central and West Asia and North Africa (CWANA) can be addressed through more efficient and sustainable use of arable land and water resources. In recent years improvements in land and water use have come from an agricultural sector that is...

When there is a correspondence between two logical systems, duality can be used to derivea correspondence between results in one system and results in another system (Russell andWilkinson, 1978). Under appropriate regularity conditions, dual functions such as normalizedprofit functions in...