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The primary drivers of future energy demand in MESSAGE are projections of population and GDP at purchasing power parity exchange rates (GDP|PPP).  In developing the Shared Socio-economic Pathways Pathway (SSP) scenarios, population and GDP|PPP projections provided by the Organisation for Economic Co-operation and Development (OECD) are used.  These projections were developed for the SSP project using the OECD Env-Growth model and MESSAGE currently uses version 9 (dated March 25, 2013).  Individual projections are provided for each of the five SSP scenarios.