Longer supply chains and deeper networks promote economic growth, according to a study by Oxford University and Harvard University.  Industries with greater supply chains do better. This was evident over long periods, according to a paper published in the Proceedings of the National Academy of Sciences of the USA.The predictions also work for nation-states, not just industry. Half of China's recent economic growth is attributable to deeper supply chains. James McNerney, Research Associate a. Sign in to read more..