Three kinds of questions for scientific knowledge

When communicating scientific knowledge to policymakers and the public, there are three levels of questions:

• Level-one questions: Anyone with even modest expertise or access to a search engine can answer these questions. For example, 'Will price controls cause shortages?'
• Level-two questions: Only the most qualified experts, within existing paradigms of scholarly knowledge, have something to say. For example, 'Can we design algorithms to assign medical residents to programmes in an effective way?'
• Level-three questions: Even the experts don't know the answers, such as what interest rates will be in two years.