infospace: process book-1-chapter-04

Extract entities, map to VSM, and synthesize analysis.
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# Double Coincidence of Wants
## Definition
The requirement in barter systems that each party to an exchange must simultaneously possess exactly what the other party desires, creating a significant barrier to trade when such matching preferences cannot be found.
## Source Chapter
Book I, Chapter 4
## Context
Smith identifies this as the primary limitation of barter systems, where a butcher with meat cannot exchange with a brewer who has beer if neither desires the other's product, demonstrating why money becomes necessary for efficient commercial exchange.
## Economic Domain
Exchange
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