Don't forget that when you care for your own parents or grow your own food, that money you've saved by not putting them in a nursing home or buying food, can either be saved, invested or spent on something else.

Lots of people spending lots of money may boost GDP in the short term, but if it isn't sustainable, then there will be a corresponding fall in GDP in future.

GDP is actually a pretty damn good measure, and if it is slowing, then it matters to us all.