Rural households have been suspected to rely heavily on goods and services freely provided by environmental resources. However, there has been no adequate quantitative analysis of this issue due to a lack of appropriate household data sets encompassing economic and environmental data. We use a...

With the overthrow of the Derg in 1991, some 500,000 ex-soldiers needed to be demobilized and reintegrated back into their communities. Successfully integrating such a large number of ex-soldiers is clearly important to social stability. While carefully targeted assistance is necessary,...

As patent data become more available in machine-readable form, an increasing number of researchers have begun to use measures based on patents and their citations as indicators of technological output and information flow. This paper explores the economic meaning of these citation-based patent...

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The availability of intra-day data on the prices of speculative assets means that we can use quadratic variation like measures of activity in financial markets, called realised volatility, to study the stochastic properties of returns. Here we provide a statistical basis for realised volatility...

This paper considers the extension of Ellison`s (2000) Radius-Modified Coradius Theorem from the uniform-mutations case to a general stochastic setting. A modified theorem is presented, with a crucial role now played by the most probable evolutionary paths between states. The form of such paths...

This paper is a first step toward closing the analytical gap in the extensive literature on the results of interactions between public and private R&D expenditures, and their joint effects on the economy. A survey focusing on econometric studies in this area reveals a plethora of sometimes...

This paper highlights a problem in using the first-differenced GMM panel data estimator to estimate cross-country growth regressions. When the time series are persistent, the first-differenced GMM estimator can be poorly behaved, since lagged levels of the series provide only weak instruments...

With around 50% of the urban men between age 15 and 30 unemployed, Ethiopia has one of the highest unemployment rates worldwide. This paper describes the nature of unemployment among young men in urban Ethiopia. We analyse the determinants of incidence and duration and find that most variables...