| http://www.w3.org/ns/prov#value | - There are very many other factors and forces other than policy as such which bear directly on the performance of an economy, including the weather and other natural factors as well as a bout of good or bad luck, sudden shifts in the external economic environment, and even outright miscalculation (Gibbon, 1996; Olukoshi, 1996; Rodrick, 1997; Mkandawire, 1998a).
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