Grand Cayman (CNN Business)1. Buybacks: Veteran hedge fund manager Mark Yusko is deeply skeptical of the stock buyback boom set off by President Donald Trump's tax overhaul. A company used to be encouraged to return money to shareholders when it couldn't reinvest in itself for a good return. The money doesn't vanish, it gets reinvested in higher growth businesses that boost the economy and jobs. Is that bad? https://t.co/sxfcmve0DA.