In the years between the Great Famine of the 1840s and the First World War, Ireland experienced a drastic drop in population: the percentage of adults who never married soared from 10 percent to 25 percent, while the overall population decreased by one third. What accounted for this? For many social analysts, the history of post-Famine Irish depopulation was a Malthusian morality tale where declining living standards led young people to postpone marriage out of concern for their ability to support a family. The problem here, argues Timothy Guinnane, is that living standards in post-Famine...