Abstract
Once one of the richest countries in the world, Argentina has been in relative economic decline for most of the twentieth century. The quantitative records of income growth and accumulation date the onset of the retardation to around the time of the Great War, and patterns of aggregate saving and foreign borrowing show that scarcity of investable resources significantly frustrated interwar development. A demographic model of national saving demonstrates that the burdens of rapid population growth and substantial immigration depressed Argentine saving, contributing significantly to the demise of theBelle Époquefollowing the wartime collapse of international financial markets.