An argument I see frequently in relation to massive infrastructure projects like High Speed Rail (HSR) is that we should simply get on and build them because they’re ‘visionary’ and ‘nation building’. For example, a commenter recently likened investment in HSR to the decision to build the Sydney Opera House. If cost-benefit analysis had been done on the Opera House, he argued, it would’ve been still-born. Thus we would’ve been denied the enormous tourism revenue and the boost to national pride provided by this magnificent building.
I expect he’s right. Formal cost-benefit analysis would probably be hard-pressed finding that the benefits of any opera house exceed the costs, either then or now. There’s therefore always a chance if you look too hard at the costs and the risks you could end up missing out on some whopping future benefits. However the problem with this sort of argument is that it’s based on hindsight. We know for a fact from the perspective of 2011 that the Opera House is a grand success. But cost-benefit analysis isn’t retrospective, it’s prospective – it helps us to evaluate projects before we commit to building them.
Here’s a “thought experiment”. Consider a contemporary proposal to spend a fantastic sum of money on (say) The Melbourne Opera House (insert your city of choice). Imagine an architect of Frank Gehry’s stature (but please not Frank himself!) was asked to ignore the cost and come up with a design that would create an “international icon”. The promise is the building would “put Melbourne on the map” and more than repay the preposterous cost over the years in tourism revenue and civic pride. Of course while it would nominally function as an opera house, what we’d really be building is a piece of architecture so powerful, distinctive and attractive, that it would be as iconic as……well, the Sydney Opera House.
The trouble is the probability of achieving this vision is close to zero. No one knows what the recipe for international icons is. We can look back and more or less pick out the vital decisions and factors that made the Sydney Opera House the symbol it is today, but doing it prospectively is close to impossible. We’d almost certainly end up with a Melbourne Opera House that was functionally compromised and cost billions more than it needed to, but which nobody outside Victoria gave a second glance.
Actually even if the Sydney Opera House planners knew with certainty in the late 1950s what we know now, I’m not sure building it would’ve been the “right” decision to take at the time. The Sydney Opera House didn’t instantly become an international symbol so most of the tourism and “icon” benefits, which probably didn’t kick in seriously until at least the 1980s, would’ve been heavily discounted back to the time the decision was taken to proceed. The net present value of the benefits might not have exceeded the cost of construction which, let’s not forget, was very high. Read the rest of this entry »