If you ever fly to Washington DC, look out of the window as you land at Dulles Airport - and you might snatch a glimpse of the single biggest story in economics right now.

There below you, you will see scattered around the fields and woods of the local area a set of vast warehouses that might to the untrained eye look like supermarkets or distribution centres. But no: these are in fact data centres - the biggest concentration of data centres anywhere in the world.

For this area surrounding Dulles Airport has more of these buildings, housing computer servers that do the calculations to train and run artificial intelligence (AI), than anywhere else. And since AI accounts for the vast majority of economic growth in the US so far this year, that makes this place an enormous deal.

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