I have now read about Purchase Manager Index thing. Still not understood it entirely.
However, the graph did show that it started to dip before Brexit. Also, since there is a lag of how PMI reflects prior months (it is just a month following Brexit) it does not really indicate the blip is because of Brexit alone.
If the graph was going up and suddenly fell after Brexit then we could have said it is Brexit to blame.
static.independent.co.uk/s3fs-public/styles/story_medium/public/thumbnails/image/2016/07/22/12/pmis_all.jpg
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