Lots of new material at MRU this week. In earlier videos we look at the relatively direct effect of geography on development, e.g. factors such as malaria and access to the coast. In videos released today we look at how geography can influence growth indirectly through the choice of institutions. We also provide background material on measuring GDP and PPP, using the Rule of 70, and we prepare the way for next week’s more technical videos on the Solow model with a brief, non-technical review of the Solow model.