This is not that unusual - in fact in the first edition of the famous textbook by Samuelson and Nordhaus, the Supply and Demand chapter is at page 447 of 622 [1]. For quite a long time it was thought that it was better to begin with macro issues and then discuss micro.

[1]: https://books.google.bg/books?id=ITXUAAAAMAAJ&pg=PP1&redir_e...