U.S. Equity Market by Technology Era

Description

This module separates the broad market-era chart from the tech-share chart because it tells a different story: value by era.

Methodology

Total U.S. equity market capitalization is decomposed into pre-industrial, industrial, information, attention, and intelligence-era bands.

Data

All chart files for this module are local to this research folder.

• era-market-cap-bands.csv

Sources

• Shiller historical U.S. stock market data Long-run U.S. market context.
• Damodaran NYU data archive Market-cap and sector context.
• GICS / S&P sector classification Modern sector classification anchor.
• BLS CPI Inflation adjustment.

Limitations

Era attribution is interpretive, especially for conglomerates and firms whose value spans multiple technological layers.