In 2017, there were five states where only one insurer participated in the health care marketplace: Alabama, Alaska, Oklahoma, South Carolina, and Wyoming. A new Commonwealth Fund Issue Brief examines the history, before and after the ACA’s passage in 2010, of the individual insurance market in five, mostly rural, states and how premiums changed as the number of carriers declined.
The Issue Brief can be obtained at http://www.commonwealthfund.org/~/media/files/publications/issue-brief/2018/mar/gabel_single_insurer_marketplaces_five_states_ib.pdf.