Not a philosopher, but scope sensitivity follows from consistency (either in the sense of acting similarly in similar situations, or maximizing a utility function). Suppose you’re willing to pay $1 to save 100 birds from oil; if you would do the same trade again at a roughly similar rate (assuming you don’t run out of money) your willingness to pay is roughly linear in the number of birds you save.
Scope insensitivity in practice is relatively extreme; in the original study, people were willing to pay $80 for 2000 birds and $88 for 200,000 birds. So if you think this represents their true values, people were willing to pay $.04 per bird for the first 2000 birds but only $0.00004 per bird for the next 198,000 birds. This is a factor of 1000 difference; most of the time when people have this variance in price they are either being irrational, or there are huge diminishing returns and they really value something else that we can identify. For example if someone values the first 2 movie tickets at $1000 each but further movie tickets at only $1, maybe they really enjoy the experience of going with a companion, and the feeling of happiness is not increased by a third ticket. So in the birds example it seems plausible that most people value the feeling of having saved some birds.
All of this relies on you caring about consequences somewhat. If your morality is entirely duty-based or has some other foundation, there are other arguments but they probably aren’t as strong and I don’t know them.
I think the money-pump argument is wrong. You are practically assuming the conclusion. A scope insensitive person would negatively value the total number of bird deaths, or maybe positively value the number of birds alive. So that each death is less bad if other birds also die. In this case it doesn’t make sense to talk about $1 per 100 avoided deaths in isolation.
A scope insensitive person would negatively value the total number of bird deaths, or maybe positively value the number of birds alive. So that each death is less bad if other birds also die.
This doesn’t follow for me. I agree that you can construct some set of preferences or utility function such that being scope-insensitive is rational, but you can do that for any policy.
Not a philosopher, but scope sensitivity follows from consistency (either in the sense of acting similarly in similar situations, or maximizing a utility function). Suppose you’re willing to pay $1 to save 100 birds from oil; if you would do the same trade again at a roughly similar rate (assuming you don’t run out of money) your willingness to pay is roughly linear in the number of birds you save.
Scope insensitivity in practice is relatively extreme; in the original study, people were willing to pay $80 for 2000 birds and $88 for 200,000 birds. So if you think this represents their true values, people were willing to pay $.04 per bird for the first 2000 birds but only $0.00004 per bird for the next 198,000 birds. This is a factor of 1000 difference; most of the time when people have this variance in price they are either being irrational, or there are huge diminishing returns and they really value something else that we can identify. For example if someone values the first 2 movie tickets at $1000 each but further movie tickets at only $1, maybe they really enjoy the experience of going with a companion, and the feeling of happiness is not increased by a third ticket. So in the birds example it seems plausible that most people value the feeling of having saved some birds.
Why should you be consistent? One reason is the triage framing, which is given in Replacing Guilt. Another reason is the money-pump; if you value birds at $1 per 100 and $2 per 1000, and are willing to make trades in either direction, there is a series of trades that causes you to lose both $ and birds.
All of this relies on you caring about consequences somewhat. If your morality is entirely duty-based or has some other foundation, there are other arguments but they probably aren’t as strong and I don’t know them.
I think the money-pump argument is wrong. You are practically assuming the conclusion. A scope insensitive person would negatively value the total number of bird deaths, or maybe positively value the number of birds alive. So that each death is less bad if other birds also die. In this case it doesn’t make sense to talk about $1 per 100 avoided deaths in isolation.
This doesn’t follow for me. I agree that you can construct some set of preferences or utility function such that being scope-insensitive is rational, but you can do that for any policy.