There has been growth in the developed world, it's just that 100% of it has been sucked up by the super rich. And by the rich, I don't mean the (bottom end of) the 1%, that's £130,000 per year in the UK. So just touching London secondary school heads and hospital consultants with a bit of private work on top. These people are not the problem, they're doing valuable work and are not rich, they're working for a living and haven't seen massive inflation in their standards of living.
The problem is the 0.001%, the super rich, these are the ones who have taken all the money and pushed so many into poverty with their profit hoarding. Now I'm sure somebody will come along and say, yes but these are the wealth creators, driving us forward, society needs them. No they aren't and no we don't. We don't need them, they need us. They need us as workers and consumers and they wouldn't have a penny without us.