This is an interesting idea. You might need to change the design a bit; my impression is that the experiment focused on getting people to donate vs not donating, whereas the concern with longtermism is more about prioritisation between different donation targets. Someone’s decision to keep the money wouldn’t necessarily mean they were being short-termist: they might be going to invest that money, or they might simply think that the (necessarily somewhat speculative) longtermist charities being offered were unlikely to improve long-term outcomes.
This is an interesting idea. You might need to change the design a bit; my impression is that the experiment focused on getting people to donate vs not donating, whereas the concern with longtermism is more about prioritisation between different donation targets. Someone’s decision to keep the money wouldn’t necessarily mean they were being short-termist: they might be going to invest that money, or they might simply think that the (necessarily somewhat speculative) longtermist charities being offered were unlikely to improve long-term outcomes.