The Economic historian, who has used the data collected by Buchanan-Hamilton to support the thesis of deindustrialization in the 19th centuiy India, is

Amiya Kumar Bagchi is the economic historian who utilized the statistical data collected by Francis Buchanan-Hamilton to support the thesis of deindustrialization in 19th-century India. Bagchi's 1976 study focused on the Gangetic Bihar region, where he compared Buchanan-Hamilton's early 19th-century survey data (1809–1813) with the 1901 Census data. He argued that the share of the population dependent on secondary activities (industry) declined significantly from approximately 18.6% to 8.5%, indicating a 'catastrophic' collapse of domestic industry under colonial rule. While historians like Marika Vicziany later challenged his methodology, Bagchi remains the primary scholar associated with using Buchanan-Hamilton's records to provide an empirical basis for the deindustrialization narrative. Other historians like Tirthankar Roy have often critiqued this 'nationalist' interpretation by emphasizing market-led transitions instead.