A pro baseball player's earnings curve has one clear turning point: free agency, or FA. Until then, a player can negotiate salary only with his own club. The moment he becomes a free agent, he can sit down at the table with every club. Prices jump the moment demand appears, because baseball is a market too.
In the Korea Baseball Organization (KBO), free agent eligibility is counted in seasons, and a season counts only when a player reaches the required number of days on the first-team roster. A player who turned pro out of high school usually needs 9 such seasons for his first eligibility, and a player who turned pro out of college needs 8. The key condition here is roster days. If a player sits out a whole season with an injury or spends a long time on the second team, that year does not fully count and his eligibility gets pushed back. The same goes for military service. That is why two players who joined the pros at the same age often reach free agency years apart.
A club that signs a free agent has to compensate the player's former club. How much depends on the player's grade. Grades are set by factors such as salary rank, and signing a top-grade player costs one player from outside the signing club's protected list plus a cash payment worth several times the player's previous-year salary. For lower grades, cash alone settles it.
The effect on the market is clear. Some club will always pay the compensation to land a top player, but solid mid-tier players can be shut out of the market because of the compensation burden. There is a range where the system, not ability, holds a player's price down, and that is the most debated part of free agency.
A free agent contract usually has three parts: length, guaranteed money, and incentives. A big free agent in his early 30s may get a deal of four years or more with billions of won guaranteed, while a free agent in his mid-to-late 30s has to accept a short deal with less guaranteed money. For the club, a free agent contract does not buy past performance. It buys the next few years, so age works as the coldest variable at the table.
When the first free agent contract ends, a player can declare free agency again once he requalifies. But requalifying usually takes four more seasons. Only players who reached their first free agency young can aim for a meaningful second contract. That is why settling onto the top team quickly after debut raises the whole long-term earnings curve. Once you understand free agency, you can see that a young player's impatience is not just personality. It is a rational economic judgment.
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