It depends on the publisher, 6X9 and some others are standard in some parts.5X8 is used also.
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.
400g
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.