Usage patterns
〈物〉の売れ行きが良いfor a product's sales to be good
The new product is selling well.
売れ行きが伸びるfor sales to grow
Sales of this book are growing.
売れ行きを調べるto check or research sales performance
The store manager checks the sales figures every week.
売れ行きが不振だfor sales to be sluggish
Sales have been sluggish this year.