Argent: If changes in the data are down to changes that are happening in societies, then this is going to have a big, long run demographic effect. But i think there ar some reason to be sceptical it will really change the game. And so robot nannies are a funny trope. But in reality, that's actually something that in japan, there's a lot of experimentation on that front precisely for this reason. So i think there are uncertainties around the degree to which this turns from a subtle shift to a widespread change.