Both Obamacare and the AHCA bet on the concept that competition among insurers will control health insurance premiums. Why they believe that is a mystery to me.
Only a relatively small portion of any premium is even subject to competition, less than 10%. The bulk of any premium is health care spending. In addition, as the graphic below shows, nearly all states have a process to review and approve premium change requests by insurers.
Betting on competition among insurers to lower premiums is a losing bet.