In a British study, sales teams used one of three headsets - left, right, both ears - for a day's selling of insurance by telephone. Those who wore the headset on their left ear outsold the others.

在英国开展的一项调查中，电话销售保险的小组使用了三种耳机——左耳机，右耳机，双耳机——一天下来，使用左耳机的销售人员业绩最好。