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So, the $5,000 to save a human life actually saves more than one human life. The world fertility rate is currently 2.27 per woman, but expected to decline to 1.8 by 2050 and 1.6 by 2100. Lets assume this trend continues at a rate of -0.2 per 50 years until eventually it reaches zero at 2500. Since it takes two people to have children, we halve these numbers to get an estimate of how many human descendents to expect from a given saved human life each generation.
If each generation is ~25 years, then the numbers will follow a series like 1.135 + 0.9 + 0.85 + 0.8 ... which works out to 9.685 human lives per $5000, or $516.26 per human life. Human life expectancy is increasing, but for simplicity lets assume 70 years per human life.
70 / $516.26 = 0.13559 human life years per dollar.
So, if we weigh chickens equally with humans, this favours the chickens still.
However, we can add the neuron count proxy to weigh these. Humans have approximately 86 trillion neurons, while chickens have 220 million. That's a ratio of 390.
0.13559 x 390 = 52.88 human neuron weighted life years per dollar.
This is slightly more than 41 chicken life years per dollar. Which, given my many, many simplifying assumptions, would mean that global health is still (slightly) more cost effective.