Congress finally passed the Republican overhaul of the U.S. tax code today and sent it to President Trump for his promised signature. Republicans promised to deliver major tax reform, and they see this as a huge legislative victory. Whether this truly represents “reform” is hotly disputed by Democrats who see it as benefitting only rich individuals and large corporations. The new tax legislation does benefit businesses with a sharply lower corporate tax rate. The Republicans are betting this will encourage companies to expand investment in commercial activities to an extent that creates more jobs and raises wages enough to deliver tangible benefits to the “middle class.” There are numerous provisions in the new tax...