When browsing through a shop or feed I would like the heart to have little number inside to show how many saves that books has and the same for the cart.

This helps us both as buyers and sellers. As a buyer I can see which books are popular at a glance and maybe consider a book I didn't know other people were also interested in. It creates urgency for me to buy instead of waiting too.

As a seller it would just make it easier to go through my listings and see at a glance which books are gaining the most interest in my own shop (currently the views are not showing in my listings page, I can only see them if I click all the way into the listing), but also elsewhere in the app to see what books are popular that I haven't though of.

A little "hot seller" or "in demand" icon added to titles that are fast sellers that can be seen in the thumbnail (instead of just on the title page for that listing), would be awesome as well.