The End of European Immigrant Servitude in the United States: An Economic Analysis of Market Collapse, 1772–1835
研究了19世纪初欧洲移民奴役制在美国消失的原因，通过定量证据发现其终结并非由于需求不足或法律限制，而是因为出现了更好的移民融资方式。
Europeans stopped using servitude to finance passage to America sometime in the early nineteenth century, but exactly when and why immigrant servitude disappeared is a mystery. Hypotheses abound, but no consensus has emerged nor have scholars tested hypotheses. In this study, quantitative evidence for the final sixty years of immigrant servitude establishes when and why it disappeared. Servitude did not end because of insufficient demand, legal restrictions, or declines in passage fares. It ended because superior methods of financing migration developed. Chance historical events, however, determined the exact timing of the end.