Answer:
The answer is: individual discrimination.
Explanation:
Individual discrimination occurs between two people, one person discriminating another. In this case, Mary refuses to rent an apartment to Millie due to her age, she is discriminating her and her behavior can be defined as ageist. However, her decision is not based in ageist laws or regulations, which is why it is not institutional discrimination, it is only her decision as an individual.
Individual dscrimination is different from institutional discrimination, however, they both have the intention to hurt the other person and they are both based upon prejudice and stereotypes, which is why individual discrimination should not be taken lightly as it also has the power to affect a person's life.
