History and cultural evolution: measuring the relationship through the Wikipedia network

Even at long time horizons, modern outcomes are in some sense bounded by history. Culture shapes how people interact and as it propagates across generations, groups with more common ancestors face less frictions to cooperation. This, in turn, affects institutional and technological diffusion, implying a society's history plays a crucial role in the causes of sustained long-run economic growth. To test this, we follow other studies by proxying for historical effects with genetic relatedness, which yields a temporal proportionality of shared common ancestry. Measuring cultural traits are more challenging. We develop a new systematic measure through network analysis of Wikipedia. Connectivity statistics over the encyclopaedia's hyperlink-directed network captures unique features of cultural relatedness. Further, as we index pages, we can coarsen the network into specific topics. The results show how history correlates broadly over a range of cultural factors. Differences across the coarsened networks demonstrate not simply that history matters, but where it matters less.