Trump's new tax bill, Canada Post union announces overtime ban and the G7 finance summit in Alberta: Business and investing stories for the week of May 25

Open this photo in gallery: Canada Post says some customers had already begun shifting to other delivery providers or cancelling mailings in anticipation of potential service disruptions.Sean Kilpatrick/The Canadian Press Getting caught up on a week that got away? Here's your weekly digest of the Globe's most essential business and investing stories, with insights and analysis from the pros, stock tips, portfolio strategies and more. Canada Post workers stay on job, refuse overtime as contract talks fall short Open this photo in gallery: People walk past the Canada Post facility in Mississauga, Ont., on May 22.Nathan Denette/The Canadian Press Canada…