infospace: process book-1-chapter-03

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/market-communication-channels.md

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+# Market Communication Channels
+
+## Definition
+
+The various means by which goods, information, and commerce flow between producers and consumers, including natural waterways, roads, and political arrangements. The effectiveness of market communication channels determines the extent of markets and the degree of specialisation possible.
+
+## Source Chapter
+
+Book I, Chapter 3
+
+## Context
+
+Smith discusses how the Danube's navigation is of little use to Bavaria, Austria, and Hungary because none possesses the whole course till it falls into the Black Sea, illustrating how political control over communication channels can limit market development.
+
+## Economic Domain
+
+Exchange
+
+---