Long-term interest rates stayed under control this week, but barely. The economy is changing for the better: this may be another false recovery, but as they have gone, this one is by far the most broad and sound since the show stopped in 2008. Last week I questioned the report of a quarter-million-jobs gained in February. Should not have, as confirming data have arrived. The National Federation of Independent Business' monthly survey of small-business owners reversed a downtrend, still in recession but brightening in February. Retail sales outperformed all guesses by miles, jumping 1.1 percent. And new claims for unemployment insurance have fallen to a lower range, about 340,000 weekly, not far from normal. Despite that strength, the Treasury this week easily auctioned $21 billion...