Last week, in this column, I argued that making the case that trade agreements improve economic welfare might no longer be sufficient to maintain political support for economic internationalism in the US and other countries. Instead, I suggested that opposition to trade agreements, and economic internationalism more generally, reflected a growing recognition by workers that what is good for the global economy and its business champions was not necessarily good for them, and that there were reasonable grounds for this belief.

The most important reason for doubting that an increasingly successful, integrated global economy will benefit US workers (and those in other industrial countries) is the weakening of the link between the success of a nation's workers and the success of both its trading partners and its companies. This phenomenon was first emphasised years ago by Robert Reich, the former US labour secretary. The normal argument is that a more rapidly growing global economy benefits workers and companies in an individual country by expanding the market for exports. This is a valid consideration. But it is also true that the success of other countries, and greater global integration, places more competitive pressure on an individual economy. Workers are likely disproportionately to bear the brunt of this pressure.