Pro-E.6 — Response to Con-D.6 (Piketty Contested)

Impact: E (Moderate) — Partially resolved.

Partial concession: Piketty’s specific r > g mechanism is debated (Rognlie on housing, Acemoglu and Robinson on institutions). However, the argument does not depend on Piketty alone. It rests on a broader claim: wealth and power concentrate over time absent deliberate counteraction, supported by:

• Pareto distributions in wealth across virtually all documented societies (Pareto 1896; confirmed by Atkinson 2015, Piketty 2014). The mechanism may vary, but the pattern is robust.

• Network effects in modern economies — platform monopolies, data advantages, network lock-in — produce concentration dynamics independent of r > g (Zucman 2019).

• Political capture: Concentrated wealth translates into political influence, producing favorable regulation that accelerates concentration. Gilens and Page (2014) demonstrate US policy outcomes correlate with elite preferences, not median-voter preferences.

The “persistent inequality without collapse” objection (Roman Empire, etc.) is redirected to Pro-A.1: persistence through oscillation is a metastable state, not a permanent one. The Roman Empire did eventually collapse, as did every other civilization that maintained extreme concentration without structural reform.

Why Impact E, not D: The concession narrows the empirical base. The broader concentration claim (Pareto distributions, network effects, political capture) requires its own rigorous development beyond citing additional sources.

(Source: Reply to C6 from OOv1 Reply Round 1b.)