To determine if a book is "very expensive," one needs a specific book title and a price point to compare it against. What one person considers expensive, another may not, depending on their budget and the book's value to them.

Factors that can influence a book's price include:

• Rarity: First editions or signed copies can command high prices.
• Condition: Books in excellent condition are typically more expensive.
• Demand: Popular or highly sought-after books may have higher prices.
• Type: Textbooks, academic books, and specialized professional books are often expensive.
• Format: Hardcover books are usually more expensive than paperbacks.

If you provide the book's title and price, I can try to offer a more context-based answer.