Mineral commodity prices and, to a lesser extent, supply have typically experienced substantial fluctuations as well as sudden, largely unanticipated, breaks. Instability has severe consequences in term of returns on mining investment and the balance of payments of the countries concerned....

Many empirically observed time series, even when behaving as stationary processes (eventually after differencing), exhibit characteristics of extremely high persistence. Unit root tests and autocorrelation functions do not always provide unequivocal indications regarding long-run dynamic...

In developing economies, market prices do not reflect relative scarcities and the fiscal system alone is less than adequate for the achievement of efficiency and equity goals. The use of economic, and eventually social, project appraisal continues to be a necessary policy instrument. Following...

Traditional surplus production models are based on restrictive assumptions of fish population dynamics and distribution, fish catch, and fishing effort, and can provide misleading guidelines for fisheries management. Following a review of two conventional models and later contributions, this...