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| | Wealth (Site not responding. Last check: 2007-11-07) |
 | | Irrigation and urbanization, especially in ancient Sumer and later Egypt, are thought to have triggered a shift that unified the ideas of wealth and control of land and agriculture. |
 | | Protection of infrastructural capital built up over generations became critical: city walls, irrigation systems, sewage systems[?], aqueducts, buildings, all impossible to replace within a single generation, and thus a matter of social survival to maintain. |
 | | However, physical capital, as it came to be known, consisting of both the natural capital that made food and the infrastructural capital that made tools, became the focus of analysis of wealth, and ultimately the thesis of Adam Smith that became the basis of modern economics. |
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