To see what President-elect Joe Biden thinks is wrong with the economy today and how he would try to fix it, look to his relationship with DuPont Co. For much of his life the company was the largest employer and philanthropist in his home state of Delaware, funding schools, libraries and theaters.
At age 29, Mr. Biden staffed his first Senate bid with DuPont employees, who opened a campaign office on the highway built by and named for the chemical giant. While bashing other big companies for tax avoidance, Mr. Biden singled…