It’s asking “how much richer would the whole world have to be to make people happier (because richer) by the same amount?”. World GDP is ~$10k/person, so I think $100k means “about as big a welfare boost as giving 100 people a 10% increase in income”.
(This is a legit way of measuring things, but I think arguably it gives the wrong impression compared to the climate numbers, which I think are more directly economic costs, which fall disproportionately on the poor, rather than equivalences. There’s also a decent case that the main reason to care about climate change should be tail risks, which I think aren’t assessed here but could change the conclusion that animal welfare effects are robustly a bigger deal than climate change.)
It’s asking “how much richer would the whole world have to be to make people happier (because richer) by the same amount?”. World GDP is ~$10k/person, so I think $100k means “about as big a welfare boost as giving 100 people a 10% increase in income”.
(This is a legit way of measuring things, but I think arguably it gives the wrong impression compared to the climate numbers, which I think are more directly economic costs, which fall disproportionately on the poor, rather than equivalences. There’s also a decent case that the main reason to care about climate change should be tail risks, which I think aren’t assessed here but could change the conclusion that animal welfare effects are robustly a bigger deal than climate change.)