From Americans for Tax Reform:

According to the R Street Institute’s 2019 Insurance Regulation Report Card, Louisiana has one of the most concentrated auto markets in the nation, which could “be an indication of unnecessarily high barriers to entry or other market dysfunction.” The lack of competition in a concentrated market prevents market forces from driving prices down and results in fewer options being available to consumers. This is likely one of the reasons Louisiana has the second highest auto premiums in the country, behind only Michigan.