"Professor Mokyr maintains that the 'Hungry Forties' were caused by the overall underdevelopment of the economy during the decades which preceded the famine. In Why Ireland Starved he tests various hypotheses that have been put forward to account for this backwardness. He dismisses widespread arguments that Irish poverty can be explained in terms of over-population, an evil land system or malicious exploitation by the British. Instead, he argues that the causes have to be sought in the low productivity of labor and the insufficient formation of physical capital – results of the peculiar political and social structure of Ireland, continuous conflicts between landlords and tenants, and the rigidity of Irish economic institutions."