Thinking about retirement?

Forgive the silly title. We drive looking forward through the windscreen, so to speak, but we need our mirrors to avoid getting hit from behind. Someone once told me the reason the windscreen is bigger than the mirror is that

A properly diverse portfolio contains assets that are less correlated than bonds and equities. Traditionally, commercial property funds have provided a significant element of this diversification. I have argued for over a decade that infrastructure is less risky than these