The Big 3 are: Hair Transplant, Hair Systems, or Shaving.
The Medium 3: are Oral Dutasteride, Oral Minoxidil, and Microneedling.
The Small 3: are Oral Finasteride, Topical Minoxidil, and Ketoconazole.
The Meh 3: are Head Massage, Vitamins, and Laser Caps.
Care to expand a bit, please? This is entirely new to me, I just read the Wikipedia article.
https://en.wikipedia.org/wiki/Novikov_self-consistency_principle