To guess what might happen once unlimited deposit insurance ends, look at how corporations have handled their cash lately.

They appear lukewarm about the extra insurance, and comfortable at big banks no matter what. Big business has yanked hundreds of billions of dollars from money market funds since the financial crisis, and stuffed them into bank accounts. When giant banks opted out of an earlier version of the unlimited insurance scheme in 2010, the money kept pouring in regardless. (See the following graphic. Text continues below.)

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