The all-in price, from the first moment. Never a fake "before" price.

Show the all-in price from the first moment it appears: no fees added at checkout, no "from" prices nobody can buy at. Round prices suit feeling purchases, precise prices suit practical ones. Never show a fake "before" price. Hidden fees make people spend more, which is exactly why they're banned.
S Evidence: strong. Large trials or many studies, pointing the same way.
P Evidence: promising. Good studies, but small or few. Use it and keep checking.
Thomas & Morwitz 2005 · Wadhwa & Zhang 2015 · Blake et al. 2021 (StubHub field experiment).
Not medical, legal or financial advice.
In The Ecosystem every framework comes with a daily action, a room that checks in, and the full library.