While many people in the effective altruism movement are vegan, I'm not, and I wanted to write some about why. The short answer is what while I'm on board with the general idea of making sacrifices to help others I think veganism doesn't represent a very good tradeoff, and I think we should put our altruistic efforts elsewhere.
There are many reasons people decide to eat vegan food, from ethics to taste to health, and I'm just interested in the ethical perspective. As a consequentialist, the way I see this is, how would the world be different if I stopped eating animals and animal products?
One factor is that I wouldn't be buying animal products anymore, which would reduce the demand for animals, and correspondingly the amount supplied. Elasticity means that if I decrease by buying by one unit I expect production to fall by less than one unit, but I'm going to ignore that here to be on the safe side. Peter Hurford gives a very rough set of numbers for how many continuously living animals are required to support a standard American diet and gets:
- 1/8 of a cow
- 1/8 of a pig
- 3 chickens
- 3 fish
Now, I don't think animals matter as much as humans. I think there's a very large chance they don't matter at all, and that there's just no one inside to suffer, but to be safe I'll assume they do. If animals do matter, I think they still matter substantially less than humans, so if we're going to compare our altruistic options we need a rough exchange rate between animal and human experience. Conditional on animals mattering, averting how many animal-years on a factory farm do I see as being about as good as giving a human another year of life?
- Pigs: about 100. Conditions for pigs are very bad, though I still think humans matter a lot more.
- Chickens: about 1,000. They probably matter much less than pigs.
- Cows: about 10,000. They probably matter about the same as pigs, but their conditions are far better.
- Fish: about 100,000. They matter much less than chickens.
Overall this has, to my own personal best guess, giving a person another year of life being more valuable than at least 230 Americans going vegan for a year.
The last time I wrote about this I used $100 as how much it costs to give someone an extra year of life through a donation to GiveWell's top charities, and while I haven't looked into it again that still seems about right. I think it's likely that you can do much better than this through donations aimed at reducing the risk of human extinction, but is a good figure for comparison. This means I'd rather see someone donate $43 to GiveWell's top charities than see 100 people go vegan for a year.
Since I get much more than $0.43 of enjoyment out of a year's worth of eating animal products, veganism looks like a really bad altruistic tradeoff to me.
Comment via: facebook
Hi -- Thank you for writing this! I'm a person who is familiar with the broad strokes of consequentialism, but I've never read any Singer and I've never seen the arithmetic laid out as plainly you've done in this blog post. First, I'll describe what I think your reasoning is, and then, fully acknowledging that I might not understand your argument very well, I'll end with a little critique. Anyone can pile onto either part, by saying that I completely missed the point of your argument, or by pointing out flaws in my own reasoning.
When I was reading your post, I got a bit lost when you switched from counting life years to counting dollars. I'm going to reduce the problem to a hypothetical person who eats 1/8 of a pig every year but otherwise only eats plants, and like you, this person values the life of a pig at 1% of that of a person. If this person decided to give up eating pig meat, he or she would save the life of 1/8 of a pig per year, or equivalently 1/800 of a person per year. We want to put a price on sacrifice that our pig eater made by giving up meat, and we do that by saying that saving the life of a person costs $100. Compare that to saving 1/800 of a person by giving up pig meat, and we get $0.12. And we conclude that the inconvenience and the diminished pleasure that you would experience would be worth far more than 12 cents.
Do I have that right?
If I do, I guess I think that these incommensurates are harder to compare than the argument allows. It reminds me of the order of magnitude estimates for the likelihood of the existence of alien life in the universe. Usually, you'll see scientists using Drake's equation to argue that it's extremely likely that alien life is out there somewhere, but occasionally you'll see a creationist use exactly the same kind of reasoning, with different parameters and different magnitudes, to show how likely it is that life on Earth is unique. Meanwhile, Goldilocks planets are discovered, the amount of matter in the universe changes by a factor of 10, nuclear arsenals are stockpiled and pandemics sweep over the planet, and none of that can be accounted for by the order of magnitude argument.
I'm not able to simplify the issue, unfortunately. For me, it's a mixture of ethical concerns, for animals, the Earth, and perhaps ultimately human health and well being.
On the other hand, for me, the take away from the story you wrote is that pig lives and human lives are at stake when we make decisions as a society. I find both ends of the argument instructive -- pigs are harmed when we farm them inhumanely, but at the same time one shouldn't overstate the value of saving pigs, as it can't really be compared to saving the life of a person.
--Bill