Answer:
by encouraging people to strive for more education.
Step-by-step explanation:
A cultural value is something that is deemed as desirable by a specific group of people. In this case, the cultural value that is represented in the poster is education, and in more specific terms, the importance of achieving a degree in education and how this is a communal effort, not just a personal enterprise. Since the image depicts a successful student who has finished her degree, it is implied that the poster aims at encouraging people to strive for (more) education.