Article summary
This study asks whether legislators change their votes when informed about an interest group’s size, economic importance and sectoral reach. Using a combination of a field experiment that randomized messages from a pro‑reform business organization, a survey experiment with lobbyists, and in‑depth interviews with senior political actors, the article tests whether informational cues about group characteristics increase legislators’ support. The contribution is a mixed‑methods, realistic test of cue‑based informational lobbying in a Brazilian setting, triangulating experimental and qualitative evidence without overclaiming generalizability.