President-elect Donald Trump, with SoftBank Group CEO Masayoshi Son at his side, announced on Monday a $100 billion investment in the US over the next four years in what would be a boost to the US economy.Trump also promised in his joint appearance with Son that the investment would create 100,000 jobs focused on artificial intelligence (AI) and related infrastructure, with the money to be deployed before the end of Trump’s term.Trump said the investment was evidence of “monumental confidence in America’s future.”The promise, made at a flag-bedecked event at Trump’s Mar-a-Lago club in Palm Beach, Florida, fits in with Trump’s vow to bolster the US economy and reduce the impact of inflation on Americans during his second term, which begins Jan.20.Trump called Son “one of the most accomplished business leaders of our time.”The Monday announcement echoes a similar pledge Son made with then-President-elect Trump in December 2016 at Trump Tower, when Son said he would spend $50 billion and create 50,000 jobs.While that money was eventually spent, it is unclear whether those jobs were created....