Mikel Arteta has been transformative for Arsenal
The Spaniard's tactical and philosophical approach to the game has fundamentally changed how the team plays football on the pitch, but he's also helped shape the club off of it.
In terms of spending, the Spaniard has seen the board go big for signings like Declan Rice, Kai Havertz and Riccardo Calafiori.
At the same time, the North Londoners have become far better sellers, as exemplified by the summer just gone
However, for all the brilliant sales Arteta has overseen in recent years, he's also made a few mistakes, including with an academy gem who left without making a single first-team appearance and is now worth considerably more than the fee he earned Arsenal.