[gpt3] a new article in English that is SEO-optimized and incorporates as many relevant keywords as possible. The article should be based on the information provided in the existing post content. Additionally, please include a dedicated FAQ section and a conclusion section to enhance the reader's experience
The fee, known as the expense ratio, is used to cover costs like custodial services, marketing and even salaries. According to research by Morningstar, the average fee for open-end mutual funds and exchange-traded funds was 0.37% in 2022, a lot lower than 20 years ago, for example, when it was 0.91%.