When evaluating economies of scale on a car order, first ask who provides the purchase discounts and loading efficiency figures, then confirm that the stock capital and sales cycle and the port, tax and after-sales spending cover this order. An incremental order can spread purchasing and shipping costs, but it also adds stock, capital and after-sales pressure; compare unit cost and turnover together.
Larger volumes don't guarantee a lower total unit cost; stock capital and after-sales spending must be calculated at the same time. For authorization and document checks, see Are bulk car orders cheaper when importing from China?. Car bulk order costs are ultimately governed by the local rules and written confirmations in force at the time of processing.