Bent Flyvbjerg studies these "megaprojects" and offers various explanations why a) they are being conducted in the first place despite the fact that b) they are

Bent Flyvbjerg studies these "megaprojects" and offers various explanations why a) they are being conducted in the first place despite the fact that b) they are usually any combination of over budget, behind schedule or below expectations in terms of their benefits. Here is an interview with him on EconTalk about the subject: http://www.econtalk.org/archives/2015/05/bent_flyvbjerg.html http://www.econtalk.org/archives/2015/05/bent_flyvbjerg.html