Take this example whereby they explain the inputs a home buyer needs to make a decision:
Most people face a future that comprises a combination of Donald Rumsfeld’s known and unknown unknowns. Choosing to buy a house, for example, involves a series of bets on land prices, interest rates, taxes, job prospects, future planning decisions in the area selected and the structural soundness of the property concerned. It is impossible for any buyer to be confident about so many variables. Any decision must be a guess.