Taxe Zucman

1 800 households in France hold wealth equal to 19 million others. That figure alone reframes the debate. The challenge was building a product that starts with the emotional hook (a single, arresting statistic) and gives citizens the tools to check every claim themselves: a calculator, a personal simulator, sourced wealth charts, and a good-faith airing of the main objections.

The simulator page opens with the line: "Spoiler: you are probably not affected." That is the right answer for 99.99% of visitors, and giving it immediately, before asking for any input, disarms the most common fear. The personal form that follows becomes a curiosity tool rather than an anxiety trigger. The same inversion governs the whole product: state the conclusion clearly, then show the working.

The debate page ("Le débat, sans bullshit") takes the same approach to political opposition. Each objection is quoted verbatim, labelled either FAUX or NUANCÉ, and then dismantled with a figure. There is no straw-manning; the strongest version of each counter-argument is the one that gets answered.

Next.js 15 App Router, Tailwind v4, MDX for the editorial blog. Every figure on every page carries a source reference; the methodology is not behind a payroll or a modal. It is a plain text file anyone can fork. The calculateur runs entirely client-side, which means there is no server to distrust: visitors can read the formula in the browser console if they want to. Motion handles the transitions; Vercel Analytics records only aggregate traffic, no fingerprinting.