That supplier is paid a monthly fee, and then has an incentive to cut printing costs by exploiting economies of scale in procurement, replacing printers with more efficient models and so forth.
供应商按月收费，并且可以通过规模采购降低打印成本获得额外报酬，用更高效的方式替代打印机等等。
Lucas looked at the large econometric models of the 1970s, models that contained hundreds of variables relating economic aggregates like income, consumption, unemployment and so forth.
卢卡斯分析了20世纪70年代的所有大型经济学模型。这些模型中含有上百个诸如收入，消费，失业等等的经济集群值。
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