The existence of localized knowledge spillovers found by Jaffe, Trajtenberg and Henderson (1993) has recently been challenged by Thompson and Fox-Kean (2005). To settle this debate, we develop a new approach by incorporating their concepts of control patents into the distance-based test of...

In the late 2000s, the world grain markets experienced severe turbulence with rapid crop price rises caused by bad crops, oil price hikes, export restrictions, and the emergence of biofuels as well as financial speculation. We review the impacts of the first four real-side factors using a world...

In the conventional social productive efficiency measurement, a DEA-based non-parametric method is typically employed to identify the piece-wise-linear production possibility frontier. Applying the directional distance-function approach a-la Luenberger (1992) to the production possibility...

This paper examines the incidence of public health subsidies in Ghana using the Ghana Living Standards Survey. Using a combination of (uniform) benefit incidence analysis and a discrete choice model, our results give a clear evidence of progressivity with consistent ordering: postnatal and...

This paper provides a case study of the Ethiopian flower export industry which successfully emerged at time when the EU market (main destination) was already characterized by increasingly stringent standards and delivery requirements. Entering this market required a multitude of capabilities at...