Strong enforcement of property rights is good for economic growth, says the conventional wisdom. The link may not be as clear cut, says Suresh Naidu. He and co-investigator Jeremiah Dittmar are digging through court records and newspaper ads on runaway slaves to come up with a measure of property rights enforcement. The hypothesis is that weak enforcement of property rights in people — slavery that is — discouraged investment in slaves and encouraged investment in manufacturing and infrastructure instead. A new angle on the link between property rights and economic growth — this is new economic thinking.