A land built by economists?

Last week I took part in a workshop organised by the National Infrastructure Commission on the economics of infrastructure and growth. It was fascinating, and particularly for illuminating a dilemma for economists thinking about the newly-prominent issue of infrastructure investment. It’s a Good Thing – but how much is needed, and which investments? How should the NIC advise on the choices most likely to increase economic welfare and growth?

There is some well-understood machinery for answering such questions, in the form of appraisals (or post hoc evaluations) using cost-benefit analysis. The trouble is that although the technique, firmly embedded in policy advice, is useful for assessing relatively small changes, it is next to useless in the context of big investment projects that involve externalities such as environmental costs and benefits or network effects, might change people’s behaviour significantly, or might have non-linear impacts which accelerate beyond a point of critical mass. These are, of course, situations that might often arise with big infrastructure projects. And the challenge is all the greater because different kinds of infrastructure will affect each other (transport and communications networks will be complementary, natural capital and flood defence schemes will interact). To cap it all, there is an economic geography dimension to this, and infrastructure will affect the distribution of economic activity over space, which will also affect the distribution of economic opportunities and incomes.

So these questions are difficult, and nobody thinks economics can answer them. What was interesting about the discussion and subsequent emails was the emergence of a basic dilemma. One of the strengths of the conventional economic approach is the intellectual discipline it enforces. Cost benefit analysis looks at the direct benefits of a project to users, and converts them into a single unit of measurement, money (although it could be owls, or happy faces). It is a powerful brake on wishful thinking.

Economics also sets out the circumstances in which wider benefits might need taking into account: when there is good reason to believe that resources are misallocated so the investment might lead to a more efficient outcome (land use in the UK would be an example – the planning system enforces many inefficiences); when there is good reason to expect a project will bring about agglomeration externalities, the additional productivity arising from there being more people in one area because there is a deeper pool of labour and skills, and know how can spread more easily; when there is reason to be confident there will be non-marginal benefits that private investors will not capture; and when infrastructure can act as a mechanism to co-ordinate private investment decisions. The latter is interesting because it suggests the prospect of multiple equilibria depending on which place or project is selected as the focal point for co-ordination.

I would add another complication, which is the scope for small changes in transactions costs or frictions to bring about big changes in behaviour. In some contexts a time saving of 10 minutes will be marginal but in others it might tip a lot of people changing their commuting or house purchase patterns. A past example is the switch from dial up internet to broadband; many economists thought this would be a small change, but it turned out to be revolutionary. The behaviour change point makes post hoc evaluations tricky, because the behaviour is endogenous to the infrastructure choices.

Everybody in the workshop broadly agreed about the basic intellectual framework (well, we were almost all economists) but the dilemma is whether it is ever feasible or sensible to allow consideration of the wider benefits. The case against – and in favour of sticking to narrow, conventional cost benefit analysis – says stick to situations where there are clear signals from market prices. For example, is there a big difference in land prices indicating resource misallocation? Otherwise, there is a danger of the kind of mistakes that have always come with ‘picking winners’ in the past. The opposing case for being more open to trying to estimate wider benefits is to ask: what would the country look like if built by economists? It would be a dreary place of functional concrete boxes in a mesh of motorways. The Victorian infrastructure we still rely on would never have been built if subject first to a cost-benefit analysis. Britain used to be considered a world leader in infrastructure but then the use of cost-benefit analysis spread widely, and now we are clearly laggards.

I’m firmly in the camp that we should be looking to develop new techniques and data to inform a wider approach. The UK economy needs infrastructure investment that will make a big difference to productivity and growth, given the self-inflicted economic headwinds we face. We need faster growth in the great provincial cities, and significant investments that will make a step-change difference in the economic well-being of people around the country in terms of air quality, flooding etc. The NIC faces quite a challenge, but also a tremendous opportunity.

My favourite books about infrastructure are Brett Frischmann’s Infrastructure: The Social Value of Shared Resources; and my colleague Richard AgĂ©nor’s (more wide-ranging) Public Capital, Growth and Welfare. Ricardo Hausmann has written about the distributional impact of infrastructure (along with natural capital, the most significant capital people on low incomes have access to).

2 thoughts on “A land built by economists?

  1. This reminds me of an old idea a friend had, which was to extend the Malthusian model so that rather than when a surplus emerges it is absorbed by population growth, instead it is used to build a cathedral. And then get data to estimate resources used building them. You may say how ghastly a country built by economists would not have these glorious monuments, but it might also not have spent hundreds of thousands of man hours building a lovely building at a time most people did not have enough to eat, died young and lived in hovels.

    It is possible to over build. The dilemma you discuss is a real one because it is easy to construct stories of positive externalities which subsequently fail to materialise. Yet I suspect basic CBA systematically underestimates benefits. Not always, but on average.

    • I suppose those cathedrals were an outcome of a rational assessment of investment options. What appears irrational to us now is that we are not applying the values and power relations in the Middle Ages. Cathedrals are valuable because, in the midst of a short and miserable life, getting on Gods good side is a good thing, and decisions about this stuff are taken by powerful ecclesiastical decision makers. Cathedrals are thus rational (of course it’s more complicated than that but my point would stand). A cost benefit analysis conducted in the Middle Ages would almost certainly have cathedrals worth building.
      A more up to date example might be high speed rail links. These is some kind of value in getting between Birmingham and London marginally quicker, and the decisions are made by a narrow set of individuals who are pretty determined to ensure these lines get built. It’s rational for the politicians and engineers responsible for planning these lines to want them- hey presto! ‘Analysis’ proves we’all build these lines.

      Where CBA is valuable is not that it tells us that cathedrals or HS2 is worth so many owls (I mean pounds), and so shut down debate about allocating resources. It’s that it should force people to reveal their values so that a more informed debate can be had.
      Where CBA can fail us is when it implies the job has been done as there’s a ‘result’, which closes down public and non expert debate.

Comments are closed.