This is the title of a piece in Nature, discussing how much evidence is needed before you bring a drug to market, and how much information you should gather after the drug is available. The reality is possibly more nuanced that is made out here, and knowing how regulation has changed and was different between countries is worth factoring in. But I think the key issue is that many people do not trust drug companies, and they are right not to do so. It was in the FT of all places, that the comparison between public perceptions of pharma and ‘the bankers’ was made. Trust has a value, a value to both parties in any exchange. And really, why do you need advertisers to get involved?