Numbers for the Innumerate: Everyday Arithmetic and Atlantic Capitalism

Area of Science:

• History of Mathematics
• Economic History
• Social History

Background:

• The rule of three was considered a fundamental mathematical skill in 19th-century America and the Atlantic world.
• Its role often marked the conclusion of basic mathematical education for many.

Purpose of the Study:

• To examine the rule of three as a crucial technology for economic inclusion.
• To explore how this mathematical tool facilitated participation in a global market economy.
• To analyze its impact on negotiation and the legitimization of capitalist practices.

Main Methods:

• Historical analysis of primary and secondary sources.
• Examination of the rule of three's application across different social strata.
• Case studies illustrating its use by workmen, women, and enslaved individuals.

Main Results:

• The rule of three democratized access to essential calculations, bridging literacy and numeracy.
• It empowered diverse groups, including the enslaved, to engage more effectively in economic transactions.
• The widespread adoption of the rule contributed to the validation of specific exchange systems and emerging capitalism.

Conclusions:

• The rule of three served as a vital technological tool for economic empowerment and social negotiation in the 19th century.
• Its accessibility fostered broader participation in the market economy, challenging traditional educational boundaries.
• The proliferation of this mathematical practice was intrinsically linked to the consolidation of capitalist economic structures.