Inflation rose again last month amid a weakening job market, two trends that would require opposite actions from the Federal Reserve to address. Excluding the volatile food and energy categories, core prices rose 3.1%, the same as in July. With growth in jobs stalling and prices rising, the US economy is showing warning signs for both jobs and inflation. The cost of travel soared, with air fares rising 5.9% just from July to August and hotel room prices rising 2.3%. Clothing costs rose 0.5% just last month, though they are still just slightly more expensive than a year ago.