Therefore, a relaxation of one unit in that constraint (an increment of one hour) would make the objective function's optimal value become better by the marginal value 1 and become 181.
因此，这个约束中放松一个单位（增加一个小时）可以使目标函数的优化值增加边界值 1，成为 181。
2
This is the amount of money you get over and above your direct costs for each unit you sell. (you can define your unit as either a product or hour of service.)
也就是超出直接成本的部分(你可以把单位设定为一个产品或者一小时的服务)。
3
Over the past four quarters, BLS reported, "unit labor costs fell 2.8 percent as output per hour increased faster than hourly compensation."