A - The concept of present value isn't a problem, it's more like a fact, derived from the time value of money. It's like saying gravity is a problem. B - Const

A - The concept of present value isn't a problem, it's more like a fact, derived from the time value of money. It's like saying gravity is a problem. B - Construction is resource intensive, no doubt about it. Without this technique the costs and resources would go up, double?, more? Many structures we take for granted, like freeway overpasses, would be impossibly expensive.