The way I framed it was unclear, but the final number is correct because I was comparing the QALYs/​$ of farmed animal interventions to that of malaria nets. See the footnote:
Assumes 40 chicken QALYs/​$, 1 human QALY/​$100, and that 400 chicken QALY = 1 human QALY due to neuron differences. Ana’s moral circle includes all beings weighted by neuron count, but she hadn’t thought about this enough.
I was directly comparing the following rough estimates
40 chicken QALY/​$ generated by broiler and cage-free interventions (Rethink Priorities has a mean of 41)
0.01 human QALY/​$ generated by malaria nets from AMF based on GiveWell data (life expectancy ~60 years divided by $6000/​life saved)
400 chicken QALY ~= 1 human QALY if we weight by neurons. Humans have about 86 billion neurons, the red junglefowl (ancestor of chickens) has 221 million, which is a ratio of 389.
40 /​ (0.01 * 400) gives you a multiplier of 10.
The way I framed it was unclear, but the final number is correct because I was comparing the QALYs/​$ of farmed animal interventions to that of malaria nets. See the footnote:
I was directly comparing the following rough estimates
40 chicken QALY/​$ generated by broiler and cage-free interventions (Rethink Priorities has a mean of 41)
0.01 human QALY/​$ generated by malaria nets from AMF based on GiveWell data (life expectancy ~60 years divided by $6000/​life saved)
400 chicken QALY ~= 1 human QALY if we weight by neurons. Humans have about 86 billion neurons, the red junglefowl (ancestor of chickens) has 221 million, which is a ratio of 389.
40 /​ (0.01 * 400) gives you a multiplier of 10.