Democratic Governor of California Jerry Brown

Democratic Governor of California Jerry Brown

Republican Governor of Kansas Sam Brownback

Republican Governor of Kansas Sam Brownback

In 2012, voters in California approved a measure to raise taxes on millionaires, bringing their top state income tax rate to 13.3 percent, the highest in the nation. Conservative economists predicted calamity, or at least a big slowdown in growth. Also that year, the governor of Kansas signed a series of changes to the state’s tax code, including reducing income and sales tax rates. Conservative economists predicted a boom.

Neither of those predictions came true. Not right away — California grew just fine in the year the tax hikes took effect — and especially not in the medium term, as new economic data showed this week.

Now, correlation does not, as they say, equal causation, and two examples are but a small sample. But the divergent experiences of California and Kansas […]

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