The article introduces a new way to measure how well financial supervision works in the US, called the financial regulatory index. It shows that from 2000 to 2009, the effectiveness of financial supervision in the US decreased. This means that the quality of financial supervision was getting worse over the past decade, and it wasn't keeping up with changes in the financial industry. In the future, the US needs to pay attention to this index, prevent financial risks, make sure financial supervision matches the industry's growth, and balance financial efficiency with stability.