The minimum investment requirement for MFS Investment Management products can vary depending on the specific fund and the account type. Generally, mutual funds offered by MFS may have different minimum investment thresholds for regular brokerage accounts, retirement accounts, and other types of investment vehicles. As a standard guideline, the minimum investment for many mutual funds typically starts around one thousand dollars, but there can be funds with lower or higher thresholds. Additionally, some funds may offer lower minimums for subsequent investments. It is always a good idea for investors to check the specific details of an individual fund, which can be found on the MFS website or in the fund's prospectus, to obtain the most accurate and up-to-date information regarding minimum investment requirements.