The key insight in effective giving is not just comparing charities, but recognizing that most individuals can dramatically increase their positive impact by redirecting donations to highly effective opportunities they are likely unaware of, achieving up to 100 times more good with their money.

Critics argue that marginal, cost-effective thinking in charity would eliminate art. This is a flawed argument. The real-world choice isn't 'all resources to malaria or art,' but rather how to allocate a small portion of one's income for maximum good, which poses no threat to the existence of art.

Critics argue moral thought experiments are too unrealistic to be useful. However, their artificiality is a deliberate design choice. By stripping away real-world complexities and extraneous factors, philosophers can focus on whether a single, specific variable is the one making a moral difference in our judgment.

For robust, high-stakes grantmaking, separate analysis into three layers. First, empirical uncertainty (what will happen?). Second, normative uncertainty (what outcomes are most valuable?). Third, meta-normative uncertainty (how should we aggregate different moral views and risk preferences?). This framework clarifies thinking.

The famous Trolley Problem isn't just one scenario. Philosophers create subtle variations, like replacing the act of pushing a person with flipping a switch to drop them through a trapdoor. This isolates variables and reveals that our moral objection isn't just about physical contact, but about intentionally using a person as an instrument to achieve a goal.

Applying financial concepts to philanthropy reveals that public acceptance hinges on framing. For example, 'Universal Basic Income' is often rejected as a handout, but functionally similar policies framed as 'Earned Income Tax Credits' or 'Child Tax Credits' garner broad support by appealing to different values.

Reaching a 100x increase in charitable impact isn't from a single change but from combining principles that each act as a multiplier. For instance, shifting focus to a more neglected problem (10x) and choosing a leveraged policy solution (10x) can result in a 100x total improvement.

Most donors choose a cause with their heart. Attempting to persuade them to switch to a more "cost-effective" cause is almost always futile and can feel judgmental. A more productive approach is to accept their passion and help them choose the most effective organization working on that specific issue.

Thought experiments like the 'River of Drowning Children' suggest strict altruism requires sacrificing your entire life. However, most plausible ethical theories reject this maximal demandingness. They acknowledge that your own well-being, family, and personal projects also hold moral weight and should not be entirely sacrificed.