Every club says it wants to promote from within. The economics of doing so are less attractive than the press release implies.
The argument for playing academy players is usually made on cost, and the cost argument is real: no fee, a lower wage, and in most jurisdictions a squad-registration benefit. What the argument leaves out is who bears the risk. A manager who picks a twenty-year-old and loses three matches is answering to a board about results; a manager who spends fifteen million on a replacement is answering about the transfer budget, which is a more forgiving conversation.
Who carries the risk
That asymmetry is why clubs with the strongest academies are not always the clubs that play the most graduates. The pipeline produces the players; the selection pressure determines whether they are used. Clubs that have actually converted academy output into first-team minutes tend to share one feature, which is a sporting director with a mandate long enough to absorb a bad season.
The fee paid to someone else
The market effect is visible in the fees paid for young players from elsewhere. A club will pay a substantial sum for a nineteen-year-old from another academy while leaving its own in the under-21 side, which is not obviously a football decision. It is a decision about accountability, and it is one of the more persistent inefficiencies in the transfer market.

