Economic warning signs, inflation and rising interest rates be darned, the U.S. manufacturing sector is on a roll and showing no signs of slowing down. In fact, economic activity in the sector expanded for the ninth consecutive month in September, according to the latest ISM Manufacturing PMI Report. The Manufacturing PMI registered 54.5% last month (a reading higher than 50% indicates expansion) as the overall economy expanded for the 23^rd month in a row.