Sargent and interest-rate options

By now, you’ve probably seen Tom Sargent’s great Ally Bank TV spot.


But, were I to needle Tom just a bit, I might ask, “Tom, the Ally Bank CD allows you the option of raising your CD rate once over its two-year life. Can you explain when to optimally exercise that option?’‘  Or (second beer), "Tom, to what portfolio optimization question is the answer, combine a two-year CD with an American option to raise the rate once?  You must have some great robust-control result here about parameter uncertainty in dynamic interest-rate models.”

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