It is the rate of change in total utility per unit change in quantity and is not the utility of a marginalunit.
它是（商品）量的每单位变动带来的总效用变动率，而不是边际单位的效用。
2
Then, optimization-based scheduling of pumped storage units with the concept of marginalunit and marginal cost is described across time intervals in the dispatch period.
然后，给出网流法在调度周期上跨时段采用边际机组与边际成本概念优化运行方式的算法。
3
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.