Many-worlds implies the future matters more

July 26th, 2012
mwi
Yesterday I wrote about a non-consequence of the many-worlds interpretation (MWI) of quantum mechanics [1], but today I have a consequence: if you believe the MWI you should care about the future a lot more than the present.

Update 2012-07-26: Mitchell Porter explains why I'm wrong and what I was missing in a comment.

Imagine you're considering whether to take a break and eat some chocolate in an hour or in two. You'll get similar enjoyment out of both choices, so you might think it doesn't matter. But if every quantum event between one and two hours from now will branch the universe, and there are lots of such events, in two hours there would be hugely many more yous to experience your chocolate break than in only one hour. The MWI implies we should be willing to make substantial sacrifices in terms of current happiness for the benefit of our future selves. In other words, your preference for investing probably isn't strong enough.

In trying to apply this to altruism you do need to be careful. Some charities are more like spending, in that their benefits are mostly in the present, while others are like investing. If I donate to the Against Malaria Foundation to distribute mosquito nets, the main benefits are preventing current or near-future people from dying. There are probably some long term effects, like a stronger economy when you have fewer people sick, but they're not the goal or the main effect. On the other hand the Future of Humanity Institute, a charity trying to prevent existential risk, is much more like an investment in that nearly all its benefit (which is really hard to predict or quantify) goes to future people. Metacharities promoting effective altruism, like 80,000 hours, Giving What We Can, and GiveWell, are another sort of investment-like charity, influencing people's future giving. And then there's the option of straight up monetary investing now and donating later.

If you accept the MWI you should be evaluating your altruistic options primarily on their future effects, with more emphasis on farther-future ones.


[1] Which I still don't know enough about to have an opinion on the truth of.

Comment via: google plus, facebook, lesswrong, substack

Recent posts on blogs I like:

Retrospective on life tracking and effectiveness systems

I’ve been doing life tracking for around 10 years, and this post is looking back at some things I learned from the data (since my previous retrospective in 2017). I also review various productivity / effectiveness systems I have tried and which ones have …

via Victoria Krakovna July 4, 2025

Linkpost for June

Effective altruism, policy, social justice, reality's surprising amount of detail, short stories

via Thing of Things July 2, 2025

Elixir's Last Dance

On May 18th, the contra dance band Elixir had their last gig ever. The dance was packed: there were three hundred people. It was the only dance BIDA has ever done where they sold tickets. People flew from across the country just to hear Elixir play one la…

via Lily Wise's Blog Posts June 5, 2025

more     (via openring)