It’s a simple study. Randomly divide people into a control group and the experimentation groups. Ask them how many days of preps do they currently have? Then, give the standard disaster pitch. Control group gets the standard info of 3 days (FEMA) or 14 days (Red Cross). Experimentation groups get different numbers. For example, maybe they are told prepping in America is rising and 30 days is the number to shoot for. Follow up with them 90 days later and ask them again the days of preps they have. If social contagion is a thing, then the groups that received the higher numbers should report higher average days of preps. It’s like the toilet paper contagion early on in COVID. We do things because we see/hear about others doing them.