The exodus was 2.8%. The mechanism was a ballot measure. Sergey Brin and 21 others · California Props 40 & 42
- What they did
- Named individuals funded the defeat of Proposition 40 — a one-time 5% tax on the net worth of Californians worth over $1bn, with a residency test date of 1 January 2026 — and simultaneously funded Proposition 42, which bans new taxes on personal property and wealth whether created by statute or constitutional amendment. Sergey Brin gave $102m and co-founded Building a Better California; Eric Schmidt $40.2m; John Doerr $40m; Patrick Collison $33m; Chris Larsen, Vinod Khosla, Michael Moritz, Ram Shriram, Frank Slootman and Stewart Resnick each between $4.5m and $17.5m. Prop 40 headed for defeat; Prop 42 led with 54% on ~60% counted.
- Window caveat, stated plainly
- The donations themselves were disclosed through October and are not inside this edition’s 72-hour window. What is in-window is the resolution: the 3 November vote and the 5 November counts. I am including it because the measurement critique below is the strongest contrarian finding available this week, not because the action is fresh.
Consensus read
The billionaire-exodus story. California threatened a wealth tax; billionaires began leaving; the state learned that capital is mobile and that taxing it drives it out. Six departures reportedly cost California $27bn in potential revenue, and Travis Kalanick’s move to Texas “prior to January” alone avoided about $180m. Mobility disciplined the state.
Contrarian read
Mobility was not the mechanism and the exodus number does not support the weight placed on it. Six of roughly 214 left — 2.8%. The other 97.2% stayed and bought a ballot measure instead, at a cost of well under one percent of their own exposure. And they did not merely block the tax: they bought a constitutional ban on the category. The durable action was Prop 42, which almost nobody led with.
Evidence that discriminates
- The denominator. 6 departures against ~214 California billionaires is 2.8%. An “exodus” frame requires a rate the data does not contain. The Legislative Analyst’s Office put the income-tax cost of departures at less than $1bn a year.
- Revealed preference of the exposed. The 22 named billionaire opponents held combined wealth of $722.1bn as of 1 September 2026 (IPS/TURN), implying roughly $36bn of Prop 40 liability. They gave over $150m — about 0.4% of the liability. Total opposition spending across Props 40, 41 and 42 reached $316.7m; Prop 42 alone drew $159m. Measured as insurance, the premium was cheap and the coverage was better than relocation: moving costs you your life, the campaign cost 0.4%.
- The residency test date was already in the past. Prop 40 keyed liability to residence on 1 January 2026. By the time the campaign was fought in autumn 2026, leaving California could not avoid the tax — the only people mobility ever helped were those who had already gone. Every “they’ll just leave” argument made during the campaign was, as to this measure, inapplicable on its face.
- The asymmetric outcome. Prop 40 failing kills one tax. Prop 42 passing bars the category — by statute and constitutional amendment — and adds a ban on retroactive application absent a budget emergency. Lorena Gonzalez is right that voters can undo it, but the default has flipped, and defaults are what compound.
What would falsify me
Cal-Access donor records. If most of the $150m+ came from donors who had already established non-California residency before 1 January 2026, then they were not insuring their own liability and my “revealed preference of the exposed” reading is wrong — it would instead be a precedent-blocking campaign funded by the unexposed, which is a different and arguably more interesting story.
Also: these totals are reported inconsistently — $293m (Forbes, mid-Oct), ~$300m, $316.7m (CalMatters), $340m+ (advocacy sources), across different committee sets and date cuts. I have used the CalMatters figure for the all-props total and the IPS/TURN figure for the 22 named donors, and they are not the same denominator. Anyone rebuilding this from Cal-Access directly should expect different numbers.
Pattern Prop 30 in 2022 drew a fraction of this money. A $300m+ personal-money campaign against a single state ballot measure is without precedent in California, and the structural measure — Prop 42 — was placed on the same ballot deliberately, so that losing the defensive fight and winning the structural one still ends in a win.