Final answer:
Marcia describes personal investment in an identity as identity commitment, highlighting the relationship between personal choices, freedom, and personal identity formation.
Step-by-step explanation:
According to Marcia, personal investment in a specific identity is called identity commitment. Identity commitment is essential to the process of identity formation which, along with exploration, constitutes part of Marcia's identity status model.
Our personal choices and the freedom to make these choices define us and reflect our personal identity. This concept contributes significantly to how we view our roles in society and how we interact with the world around us. These choices can be related to our careers, our spending habits, our charitable actions, and how we prioritize different aspects of our lives.