OMAHA, Neb. (AP) — A survey of supply managers in nine Midwest and Plains states suggests the regional economy will grow slowly over the next three to six months, if at all. The Business Conditions Index dropped to a growth neutral 50.0 in December from 52.6 in November. Creighton University economist Ernie Goss oversees the survey, and he says surveys over the past several months “indicate that slowdowns in the national and global economies are putting downward pressure on the regional economy.”