A new report is raising alarms about Kansas City’s economic competitiveness. In “Prosperity at a Crossroads,” the Mid-America Regional Council and the Brookings Institution found several bright spots, but also uncovered signs that our region is falling behind cities of similar size. In the 1990s, Kansas City regularly outpaced the national average for growth in economic output, wages and new jobs. That’s no longer true. The region’s output grew by…