I could not answer the question please help me.
There was a long que in front of Strand bookstore in New York City for 8 p.m. books giveaways. By noon, hundreds of Paula Hawkins fans had lined up for a chance to attend the book discussion and to get a free signed copy of her most popular books published in 2017 into the water" When Paula Hawkins gave away books, what was free and what was scarce? Explain your answer.