Hi Jen,
You’re right. I believe the source of influence does depend on the situation at hand. From your example, I see how all sources came to play and at what point in the situation. When the vaccines came out, I for one was nervous about getting it but after my supervisors had it and admitted to having no effects, I got my shot the next week. And it agree, it has protected me and reduced the degree to which I got sick when I had COVID compared to those who didn’t. Good job!