The next production principle you can apply is to allow slack—a bit of looseness in your scheduling. Highway planners, for example, know that a freeway can handle an optimum number of vehicles. Having fewer cars means that the road is not being used at capacity. But at that optimum point, if just a few more cars are allowed to enter the traffic flow, everything comes to a crunching halt. With the new metering devices that control access during the rush hour, planners can get a fix on the right number. The same thing can be done for managerial work. There is an optimum degree of loading, with
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