Change the discounting rules so that harm to people in the far future is not counted as too small in policy cost-benefit math
Steps to make it happen
- Countries and towns turn costs and benefits into money before they decide on big building projects or environmental rules.
- In that math, a method called discounting counts money and harm as smaller the further away in the future they are.
- First, every calculation will publish how much smaller it makes the future.
- People will stop counting harm to future people as smaller just because we do not like waiting.
- For plans whose effects last a hundred years, the discount is eased the further ahead we look, so harm is not made too small.
- The discount rate is decided in talks that include experts on how to think about right and wrong and young people, as well as money experts.
- The results are shown side by side for several rates, so people can see how the answer changes.
- Harm that cannot be undone, such as a species dying out, is always written out and compared separately from the money math.
- Counting in a way that does not treat the lives of future people as less important becomes normal.
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The proposal in detail
This proposal covers cost-benefit analysis done by governments, local authorities and international bodies, meaning the math that turns the costs and benefits of a policy into money so they can be compared, when the effects last for several decades or more. Climate change measures, disposal of radioactive waste, large dams and levees, protection of forests and seas, and long-term social security systems all fall under it. First, the discount rate used in the calculation and all the reasons for it are made public. The discount rate is shown in two parts. One part comes from expecting that people in the future will be richer than we are now. The other is "pure time preference," which means treating something as less important simply because it lies in the future. Because the second part would give people different value only because they belong to different generations, the rule is to set it at zero or close to it. On top of that, a method is adopted in which the discount rate is lowered step by step as the evaluation period gets longer. To check whether the conclusion depends on how the rate was chosen, results are also shown for several values, including high and low rates. Harm that cannot be undone, such as the extinction of species or land that can no longer be lived on, is not handled by a dollar amount alone and is shown in a separate list. Guidelines for the discount rate are made by an independent committee that includes ethicists and representatives of younger generations as well as economists, and they are reviewed every set number of years. Projects with short evaluation periods and emergency responses right after a disaster stay with the conventional method. For problems that cross borders, the aim is to share common guidelines through international bodies.
BenefitsLong-term harm is counted fairly
The biggest advantage is that it prevents harm in the far future from being almost ignored in the math. Problems that move slowly and last a long time, such as climate change and the buildup of harmful substances, are treated closer to their true weight when policies are compared. Also, by making the discount rate and its reasons public and showing results for several values, citizens, legislatures and the press can check which assumptions a policy conclusion rests on. Value judgments that used to be made only among experts become a subject of public debate, which raises the quality of democratic decision-making. In addition, the assumptions behind the math, which used to differ from one field or ministry to another, are made the same, so there are fewer inconsistent judgments, such as valuing the future highly in one policy and lightly in another. A system that shows irreversible harm separately from money also acts as a brake, so that losses to nature and culture that are hard to turn into numbers are not overlooked. Its value lies in expressing responsibility to future generations not as a matter of feeling but as a concrete rule of calculation.
DrawbacksA heavier burden on people alive now, especially the poor
What opponents worry about most is that lowering the discount rate makes it easier to reach conclusions that ask too much of the present generation. If benefits in the far future are counted as large, almost any long-term investment could be judged worth doing, and its cost falls on people today in the form of taxes, prices and jobs. In particular, there is a persistent question of whether it is just to make people who are in poverty now, or people in developing regions in a hurry to grow, endure hardship for the sake of people who are not yet born and will probably be richer than they are. Also, the discount rate plays a role in reflecting the benefits that the money could have earned if it had been used elsewhere, and some point out that lowering it for ethical reasons could make the use of limited funds less efficient instead. Moreover, there is no single right answer about which rate is correct, and there are practical worries as well: the makeup of the committee could steer the conclusion, and the math becomes more complicated, which could delay decisions on projects. Wariness about experts who were not elected holding the power over value judgments cannot be ignored either.
Learn the background
In many societies, when deciding on public works or regulations, people convert costs and benefits that will arise in the future into present value and compare them. This is called discounting, and it rests on the idea that 100 yen today is worth more than 100 yen next year. Over a short period this causes little trouble, but for policies whose effects last more than a hundred years, things change. For example, using a discount rate of just a few percent a year means that harm a hundred years from now is counted as less than one hundredth of its weight today. For problems like climate change and nuclear waste, where the present generation receives the benefits and generations in the distant future bear the harm, the choice of this one number can flip the conclusion about whether action is worth taking. Even so, the discount rate has often been treated as a technical assumption, and it has been set without telling ordinary people what value judgments it contains. People who are not yet born cannot vote or protest. That is exactly why the question of how much future people should count needs to be brought out from inside the calculation and thought about by society as a whole.
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This proposal was written in Japanese by AI (claude-opus-5-5, policy version 2026-10-15d) and translated by AI (claude-sonnet-5-5). Nobody has checked the facts. Read the original (日本語) How the AI writes