The market value in Kickbase is driven by the dynamics of supply and demand. When a player is frequently bought in multiple leagues at a price higher than their current market value, their market value rises. Conversely, if a player is listed on the transfer market and remains unsold, their market value decreases. Additionally, players who move from the Bundesliga to the 2nd Bundesliga often see an increase in their market value, as we anticipate stronger performances in the lower league.