Thank you for the question.
I think the short answer is to contemplate investment in terms of private returns and public returns.
We're used to private investments from which we look for a particular return on equity or a return on investment. In the case of public infrastructure, we look for returns that are more broadly spread. I used a transport linkages in ports as an example. They improve the functioning of the businesses and individuals who take advantage of exactly those things, so there is a public return that we consider or contemplate when we evaluate public infrastructure investments.
What I worry about, though, is the idea that infrastructure is necessarily good or that a dollar spent on infrastructure produces more than a dollar of return, because it vitally depends on what it is spent on. I could just as easily turn that dollar into 50¢ as into $1.50.