西尔维娅·瑟拉普教授所著的《中世纪伦敦商人阶层1300-1500》，合理评估了其时伦敦商人阶层的数量，细致分析了商人和乡绅间的对流问题，并对工商业中数量极少的女性从业者和帮工会问题给予了关注。由她对商人阶层参与政治、接受教育和从事慈善的研究中，不难窥见处于过渡时期的伦敦商人阶层传统性和先进性兼具的特点。城市经济社会的发展，助推了这一中间阶层的成长；同时，他们又加快了社会转型和变革的步伐。%Sylvia L. Thrupp, who wrote The Merchant Class of Medieval London, 1300-1500, evaluated the number of London merchant class at that time reasonably, analyzed the problem of fluxion between merchant class and gentry carefully, and gave attention to the few women in manufacture and business and help the fraternity. From her research on the merchant class in politics, education and philanthropy, it is not hard to see traditional and advanced characteristics both in the merchant class during the transitional period. The development of urban economy and society, promoted the growth of the middle strata, at the same time, they also accelerated the pace of social transformation and change.
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