In this paper, published in The Economic Journal, Kerr, Grover and Ghani (2015) investigate the impact of transport infrastructure on the organisation and efﬁciency ofmanufacturing activity. The Golden Quadrilateral (GQ) project upgraded a central highway networkin India. Manufacturing activity grew disproportionately along the network. These ﬁndings hold instraight-line IV frameworks and are not present on a second highway that was planned to be upgraded atthe same time as GQ but subsequently delayed. Both entrants and incumbents facilitated the outputgrowth, with scaling among entrants being important. The upgrades facilitated better industrial sortingalong the network and improved the allocative efﬁciency of industries initially positioned on GQ.