Using recent financial and traffic data on a large sample of airports worldwide, we develop a composite non-standard profit function approach to estimate cost and revenue efficiencies of Spanish airports. Results show that, while profit margins under cost-efficient conditions are consistent with the existing literature, the important losses experienced by small airports in Spain are largely due...

When a user shares her data with online platforms, she reveals information about others. In such setting, externalities depress the price of because once user's is leaked by others, has less reason to protect and privacy. These depressed prices lead excessive sharing. We characterize conditions under which shutting down markets improves welfare. Platform competition does not redress problem exc...

A logistics chain in the South African sugar industry has been defined as the different agents responsible for growing, hauling and milling sugarcane. Inefficiencies in a logistics chain can be broadly classified into two categories: ! Individual inefficiencies associated with an inappropriate technology and/or the management practices of individual members of a logistics chain. ! Collective in...