California billionaires invest 40 million dollars in campaign against wealth tax

Summary

California billionaires have invested nearly 40 million dollars in a campaign against Proposition 40, which proposes a one-time five percent tax on the wealthy with assets exceeding one billion dollars on November's ballot. The opposition group Build a Better California has raised over 110 million dollars by August from various donors, including 100 million from Google co-founder Sergey Brin, who relocated to Nevada to avoid the potential tax.

This summary was written by a language model from the 3 sources listed below.