hand holding smart phone Andanalysts at Bank of America Merrill Lynch published a note lastweek concluding that days during which Trump tweets relativelyfrequently tend to see negative stock returns of 9 basis points onaverage. (Photo: Shutterstock)

(Bloomberg) –Two of the largest Wall Street banks are trying tomeasure the market impact of Donald Trump's tweets.

Analysts at JPMorgan Chase & Co. have created an index toquantify what they say are the growing effects on U.S. bond yields.Citigroup Inc.'s foreign exchange team, meanwhile, report thatthese micro-blogging missives are also becoming "increasinglyrelevant" to foreign-exchange moves.

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