By John W. Schoen, CNBC
Add one more signal that the U.S. economy is slowing down.
Sales and profits are falling at more of America's biggest companies, according to the latest quarterly survey of a group of business economists.
The share of those reporting stronger sales dropped to the lowest level in seven years, according to the National Association for Business Economics. And, for only the second time since the end of the Great Recession, more respondents said profits were falling than those who said profits were rising at their companies.