Please don’t treat cost-effectiveness estimates as such an exact science. There are so many subjective choices you make in them. For example, you could say that cage-free campaigns speed up changes by 5 years, or 50 years. Both choices are defensible but the result will be 10 times different just based on this choice alone.
It’s impossible to tell without seeing the THL’s estimate, but they probably were conservative when estimating their cost-effectiveness. It’s what I would do if I was doing such estimate for THL. $2.63 per hen impacted is already high enough for most people to want to donate. Maybe it’s even better because it’s more believable. And if they make it less conservative, someone might criticize them. In any case, THL took down the $2.63 estimate, so that’s a strong reason not to treat it seriously.
Please don’t treat cost-effectiveness estimates as such an exact science. There are so many subjective choices you make in them. For example, you could say that cage-free campaigns speed up changes by 5 years, or 50 years. Both choices are defensible but the result will be 10 times different just based on this choice alone.
It’s impossible to tell without seeing the THL’s estimate, but they probably were conservative when estimating their cost-effectiveness. It’s what I would do if I was doing such estimate for THL. $2.63 per hen impacted is already high enough for most people to want to donate. Maybe it’s even better because it’s more believable. And if they make it less conservative, someone might criticize them. In any case, THL took down the $2.63 estimate, so that’s a strong reason not to treat it seriously.