(Wall Street Journal) — Employers could soon see a major slowdown in productivity, new research suggests. Thirty-two percent of U.S. workers say they are seriously considering leaving their employers, according to a survey released Monday by Mercer LLC, a global consulting company. Mostly young workers — 40% of employees ages 25 to 34 and 44% of those 24 and younger — have one foot out the door. The survey was conducted at the end of 2010 on Mercer’s behalf by research firm Toluna, which polled more than 2,400 U.S. workers nationwide. While respondents hail from employers of various sizes – the smallest with between 100 and 199 workers and the largest with 5,000 or more — the findings could prove particularly troublesome for small-business owners. Their workforces are normally limited in size, and the weak economy has forced many in recent years to downsize to even lower levels.