According to US Customs and Border Protection, building and maintaining the existing 670 miles of border fencing on the US-Mexico border would cost $6.5 billion over the barrier’s expected 20-year life cycle. At this price, fortifying the remaining 1,300 miles of the Mexico border would cost more than $12.6 billion.
然而现有边境墙可谓事倍功半。以色列在约旦河西岸建立的边境墙每英里耗资超过一百万美元。据美国海关与边境保护局的数据，建设和维护现有670英里墨西哥边境隔离障将在隔离障设施20年的生命周期中耗费65亿美元。照此推算，在剩余1,300英里墨西哥边境依样画葫芦的代价将超过126亿美元。