Feb 20 (Reuters) - Persistent inflation combined with President Donald Trump's aggressive trade policies have reignited concerns of stagflation—a troubling mix of slow economic growth and high inflation, reminiscent of the 1970s. Despite these concerns, markets remain largely optimistic about his pro-growth initiatives. Although stagflation has frequently been discussed as a potential risk over the past 50 years, it has yet to materialize as a serious threat. Still, in recent weeks, it has