In light of the greater stress on productivity that has changed American work practices over the past decade, one might think further potential gains would be relatively small. But a recent survey by Yankelovich Partners Inc. for William M. Mercer Inc. indicates that workers don't agree.

Although 70% of the 1,200 workers interviewed said they were happy in their current jobs, 86% felt they could still boost their productivity by an average of 26% given the right incentives and conditions. The biggest barriers to higher productivity: inadequate supervision and employee involvement in decision-making, too much work, and insufficient rewards and chances to advance.

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