This chart shows the countries responsible for 80% of world economic output. The weights are getting a bit old, and these days, China is prolly bigger, with the others proportionately each a little smaller. Nevertheless, it still gives one a good idea of which economies to watch to see what's happening in the world.
I'm in the process of adjusting my programs to allow for variable GDP weights when I calculate things like world industrial production or the 'Big 8' PMI. But it's a big task, and I'm wrestling with the maths and the coding. Don't hold your breath.
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