Educated and wealthy persons are equally as likely to become research subjects as the uneducated and poor.

Research studies tend to disproportionately enroll participants from lower socioeconomic groups due to issues such as lack of access to healthcare, financial incentives for participation, and less knowledge about research and the risks/benefits involved. Additionally, there may be cultural or language barriers that make it difficult for individuals with higher levels of education or wealth to participate in some studies.