there was a long que in front of Strand bookstore in New York City for 8 pm 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 book published in 2017 "into the water". When Paula Hawkins gave away books, what was free and what was scarce? explain your answer
When Paula Hawkins gave away books, some amount of books was free for limited number of visitors, but the number of books was scarce, because the books were free for visitors of discussion only.