Bill Gross says this secret condition made him a successful investor — and infamously short-tempered

Bill Gross retires on Friday as a portfolio manager with Janus Henderson Group Plc, the firm he joined in 2014.Patrick T. Fallon/Bloomberg files

Even after one of the most storied careers in financial markets, Bill Gross has a few surprises left.

For one, he’s been diagnosed with Asperger’s syndrome, the autism-spectrum disorder. Gross says he lived most of his life unaware of the condition and now believes it helps explain not only why he was such a successful investor for so long but also why he could, by his own admission, rub people the wrong way.

Gross, long one of the most vocal critics of post-crisis stimulus, now sounds like a near-convert to modern monetary theory. He says deflation poses a huge challenge for central banks, admires what Japan has done to revive its moribund economy and thinks the U.S. government should consider doubling the size of its deficit.

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