What is the fine-grained topic of the following text: At one point, the panel digressed into a quasi-debate about the correlation component of marketing mix modeling vs. causality; an audience member called out that critics of the marketing mix model are, inherently, stakeholders that could potentially take a budget hit if attribution/mix models dictate that action, should they claim that statistical regression is flawed. Only return the topic.
Debate on Marketing Mix Modeling and its impact on budget allocation