Why is UC tuition so expensive?

Good day, I'm curious to understand why the tuition fees at the University of California are so exorbitant. Could you please elaborate on the various factors that contribute to this high cost? Are there any specific initiatives or policies in place to address the affordability issue for students, especially those from lower-income backgrounds? It seems that the escalating costs are a growing concern for many, and I'm keen to gain a deeper understanding of the situation. Thank you in advance for your insights.