The explanations put forth during the nineteenth century to account for Ireland's economic condition may be grouped under three heads. The first was associated with the conceptual framework of the English classical economists and stressed overpopulation and excessive subdivision. A second approach, which might be called the underdeveloped-country explanation, emphasized the need for social overhead capital—drainage, flood control, communications, and education. The third approach argued that defects in the land tenure system were at the root of Ireland's failure to develop a prosperous economy.