The sales and marketing stage in printing closely intertwines with the editorial process.  Sales people start marketing talks with their customers to build early interest, when front cover images are produced or chapters are edited.  To gauge possible sales, publishing companies produce advanced information sheets which may be sent to customers or overseas publishers.  The measured early interest may affect the formatting of the book and the strategy employed to sell it.  If interest from foreign publishers is high, co-publishing deals sharing printing costs in producing large print jobs may be established.  Co-publishing deals help lower the per-unit cost of the books.  Conversely, the print-run of the book may be reduced if initial feedback is not as promising as expected.