Although supermarkets have to pay for the plastic bags, consumers bring them far greater economic rewards in comparison to this minimal cost.
尽管是超市购买的塑料袋，但是这项花费相比消费者为超市所带来的回报来说是微不足道的。
2
The comparison of technical performances and economiccost have been made among five pipe materials of more representative to show the advantages and disadvantages of different materials.
针对可供选择的五种比较有代表性的管材，分别进行了技术特性、经济造价的比较，明确了参比管材的优缺点。
3
The paper thus proposes three methods to measure the indirect cost: material equity, economic added value, and stepwise chain comparison.