California Tests the Laffer Curve Hypothesis

As California raises its marginal tax rate on the rich, will tax revenue rise or fall?    France is running another tax field experiment.  Geographic areas with exceptional quality of life are more likely to be able to raise taxes without experiencing sharp out-migration.   David Beckham lives near UCLA.   What marginal tax rate would nudge him to move back to the UK?  For some evidence on this question, read this paper.