CEOs of middle-market companies are split on whether U.S. trade policy is helping the nation’s economy, with nearly 60 percent reporting their businesses are feeling the effects of new tariffs on imports from China and Mexico, according to the latest poll from Marcum LLP and Hofstra University’s Frank G. Zarb School of Business. At the same time, the survey found that business leaders are positive about the overall business environment. Seven out of ten CEOs rated their outlook for the coming year as eight or higher out of 10.