The percentage of sales should be increased, that the players who have been in the club is 97%, and only bought players 75%, and that its proportion sales increases until it reaches 97%.
This regulation will encourage managers to maintain players longer in the club, and therefore will reduce the number of transfer who execute one club during the season.
Percentages are given as an example, the admins GKO will adopt or specify some other value, and of course how much will that percentage to increase on a weekly basis