Martin Wolf and what to do about the commodity shock

Martin Wolf's column today reflects on the commodity shock on the basis of the data provided by the World Bank in the last Commodity Markets Outlook. As has been the prevailing consensus he suggests that this is an unprecedented shock, larger than the oil shocks of the 1970s, and any other commodity crises of the last 50 years.

In his words, based on the World Bank: "the initial impact of the closure of the strait was a global loss of 10.1mn barrels a day of oil in March. This was much larger than the impact of the Iranian revolution in 1979, the Arab oil embargo in 1973, Saddam Hussein’s invasion of Kuwait in 1990, or the Iran-Iraq war in the 1980s."

The current data on the price of oil has not yet confirmed these pessimistic predictions. The issue might be related to how much of a chockepoint the Strait of Hormuz really is, and how trade can adapt to it. Note that between 1967 and 1975 the Suez Canal was closed and forced oil shipments around the Cape of Good Hope. This caused a surge in transport costs, incentivized the development of massive supertankers, and forced a rerouting of trade, but it had limited initial impact on oil prices compared to the 1973 oil crisis.

It is obviously to soon to say, but so far the current oil shock has not lived to previous ones, when oil producing countries in OPEC had more power. Figure below shows the nominal and real price of Brent oil, which remain quite below the 1970s peaks.

Wolf is on the pessimistic side of things, and suggest, correctly on that, that costs will be unevenly distributed and that action to avoid worst problems is necessary.  He says: "this is a sizeable disruption, which is sure to hit many of the world’s poorest people and most vulnerable countries hard. The rise in oil and fertiliser prices guarantees that. This underlines the moral case for continuing to provide international assistance." That's all good, even if one is more cautious about possible outcomes.

But then he goes on to say that: "central banks are going to have a tricky time navigating the consequences. But they must not let inflationary expectations slip out of control." In other words, this is going to hurt the poor, and he thinks it will very much, since this is an unprecedented shock, but central banks should not care, and be concerned only with inflation expectations.

Before the Pandemic inflation there was some growing understanding, now less so, that inflationary expectations are not that relevant (on that see this). Jeremy Rudd wrote an article for ROKE suggesting that modern macroeconomics assigns too much importance to inflation expectations, with weak theoretical and empirical justification. Measures of inflation expectations (surveys, market-based) are noisy, inconsistent and weakly correlated with actual inflation outcomes. For him, this makes them unreliable as a key driver in models.

If inflation is caused by a hike in costs of production, there is very little that a hike in interest rate could do to control it, other than repress wage increases by slowing down the economy. Not that this should be a major concern in most advanced economies, at least.

My guess is that the impact will be smaller than expected, and that central banks will overreact. That might be the case of the Fed today, that should reduce rates, but probably won't because of inflationary expectations.