infospace: process book-2-chapter-03

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/spare-revenue.md

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+<!-- generated: provider=openrouter model=arcee-ai/trinity-large-preview:free date=2026-02-19 source=book-2-chapter-03 -->
+
+# Spare Revenue
+
+## Definition
+
+That portion of revenue which remains after necessary subsistence is met and
+which may be employed in maintaining either productive or unproductive hands.
+Productive labourers have little spare revenue, while landlords and merchants
+have most to spare, giving them greater influence over the proportion of
+productive versus unproductive labour in society.
+
+## Source Chapter
+
+Book II, Chapter 3
+
+## Context
+
+Smith explains how different social classes use their revenue, noting that
+spare revenue is the key determinant of whether additional labour will be
+productive or unproductive, thus affecting capital accumulation and economic
+growth.
+
+## Economic Domain
+
+Distribution
+
+---