It’s striking to see Donald Trump, who built his re-election campaign around attacking the “radical left”, now borrowing some of its economic policies. In just months, he has shifted from denouncing “communist” price controls to saying he would implement them, and from defending tax breaks for the wealthy to proposing tax increases on those earning more than $2.5m a year if it benefits poorer Americans. These moves echo longstanding proposals from progressives like Bernie Sanders – despite Mr Trump’s past efforts to portray such ideas as “lunatic”. The irony is hard…