That depends on the type hardback or paperback.
Less than how much you have bought them. The hardback first editions are still sold.
For hardback it cost $17.99 in U.S
They are $17.99 each in hardback!
For every hardback book, there are nine paperback books.
Someone looking for popular hardback books might look to borrow them at a library. One looking to purchase a hardback book might do so on Amazon or Chapters.
No it is in paper back to
Some are hardback because the book is new and more people would want to buy it so they make it more expensive when hardback. Paperback: because it's old and less people are interested.
Practically as long as people keep buying the book.
It depends what version you buy and where you buy it from. A UK hardback edition from Amazon costs £11.39.
A book that has a cover made out of cardboard, or leather, or cloth. Hardback (also called hardcover) books are sturdier than paperback books. Paperback books have covers made of thin cardboard and they tear easily.
Flexi binding or (Dutch binding) is a very popular book binding technique between a paperback and hardback binding. A flexibound book is a less expensive option than hardback binding, but offers a perceived higher value than a traditional paperback. A flexibound book is a book where the cover is made using Artcard Board with endpapers glued to the front and back of the book like a hardback bound book. This kind of book binding is almost similar to a hardback book but it does not use any inner board. The covers of the book are frequently made of art paper 210gsm or above. The book cover's may have a glossy or matt lamination applied and is bound with a round backed spine, which allows the book to lie flat.