Lacazette, who has been among European football's best strikers in recent seasons, is the kind of player with the potential to push the Gunners on to the next level.
Obviously, Arsenal had high hopes of bringing Lacazette to North London. To be close to €50m is something unique, and will be a record for Arsenal and a record for Lyon.
Of course, the Premier League will be a different challenge altogether for Lacazette.
Meanwhile Alexis Sanchez claims he knows whether he will stay at Arsenal or leave this summer - but the Chile forward is refusing to make his decision public.
Atletico Madrid appeared favourites for his signature until the LaLiga outfit were hit with a transfer ban, while Arsenal are reportedly interested.
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Considering the prices that are being suggested for various players around Europe, that seems like a very reasonable fee, although Arsenal have been made to regret purchasing Ligue 1 strikers on a number of times before. Barcelona want a reported £26.5 million for the player who has seen limited opportunities since joining from Atletico Madrid in 2015.
The signing of Lacazette is a significant one. "But the moment has not come".
But the teenager hinted he could be ready to go when he removed any mention of Monaco from his Twitter profile.
You can gauge how special a player is and how special they've been by their involvement on the international scene.
Competition is fierce in the middle of the Napoli midfield, though.
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John Wall was offered a four-year extension worth $168 million by the Wizards, also falling into that so-called Supermax category. In 2016, the league signed a new broadcasting deal worth $2.66 billion a year with ESPN and TNT, which saw the salary cap rise.