I think this could be an interesting avenue to explore. One very basic way to (very roughly) do this is to model p(doom) effectively as a discount rate. This could be an additional user input on GiveWell’s spreadsheets.
So for example, if your p(doom) is 20% in 20 years, then you could increase the discount rate by roughly 1% per year
[Techinically this will be somewhat off since (I’m guessing) most people’s p(doom) doesn’t increase at a constant rate, in the way a fixed discount rate does.]
I think discounting QALYs/​DALYs due to the probability of doom makes sense if you want a better estimate of QALYs/​DALYs; but it doesn’t help with estimating the relative effectiveness of charities and doesn’t help to allocate the funding better.
(It would be nice to input the distribution of the world ending in the next n years and get the discounted values. But it’s the relative cost of ways to save a life that matters; we can’t save everyone, so we want to save the most lives and reduce suffering the most, the question of how to do that means that we need to understand what our actions lead to so we can compare our options. Knowing how many people you’re saving is instrumental to saving the most people from the dragon. If it costs at least $15000 to save a life, you don’t stop saving lives because that’s too much; human life is much more valuable. If we succeed, you can imagine spending stars on saving a single life. And if we don’t, we’d still like to reduce the suffering the most and let as many people as we can live for as long as humanity lives; for that, we need estimates of the relative value of different interventions conditional on the world ending in n years with some probability.)
I think this could be an interesting avenue to explore. One very basic way to (very roughly) do this is to model p(doom) effectively as a discount rate. This could be an additional user input on GiveWell’s spreadsheets.
So for example, if your p(doom) is 20% in 20 years, then you could increase the discount rate by roughly 1% per year
[Techinically this will be somewhat off since (I’m guessing) most people’s p(doom) doesn’t increase at a constant rate, in the way a fixed discount rate does.]
I think discounting QALYs/​DALYs due to the probability of doom makes sense if you want a better estimate of QALYs/​DALYs; but it doesn’t help with estimating the relative effectiveness of charities and doesn’t help to allocate the funding better.
(It would be nice to input the distribution of the world ending in the next n years and get the discounted values. But it’s the relative cost of ways to save a life that matters; we can’t save everyone, so we want to save the most lives and reduce suffering the most, the question of how to do that means that we need to understand what our actions lead to so we can compare our options. Knowing how many people you’re saving is instrumental to saving the most people from the dragon. If it costs at least $15000 to save a life, you don’t stop saving lives because that’s too much; human life is much more valuable. If we succeed, you can imagine spending stars on saving a single life. And if we don’t, we’d still like to reduce the suffering the most and let as many people as we can live for as long as humanity lives; for that, we need estimates of the relative value of different interventions conditional on the world ending in n years with some probability.)