Service Time, Salaries, and the Reliance on Free Agents
It would likely surprise no one to learn that players who reach free agency are the ones who make the most money. The owners and players together have devised a system wherein players at the beginning of their careers make the league minimum, players in their next few years earn a little bit more, and players who possess six-plus years of service time… they make a ton of money. That system has made it so that clubs with greater payrolls typically employ more of this last type of player, while teams on the lower end of the spectrum rely on more minimum-salary players. Let’s examine that gap and which teams are the most reliant on free-agent veterans to fill their rosters.
To illustrate the effects of the system, let’s begin by looking at all MLB player salaries along with service time. The graph below (courtesy of Sean Dolinar) includes 750 data points, each one representing a player likely to appear on a major-league Opening Day roster. While service time is often presented as in years and days, I’ve used a slightly different format here. For the purposes of a better-looking graph, days were divided by 172 (a season’s worth of service time) to get a more accurate picture of how close each player is to having recorded another full season in the majors.

We see a great number of points clustered near the bottom left of the table. Those represent the players who’ve recorded the least service time and are (mostly as a result) also earning the least money. The few outliers on the left of the graph are composed mostly of Asian and Cuban free agents whose situations more closely resemble players with at least six years of service time. Next, there’s another cluster at Year Three. That’s when players become eligible for arbitration. Salaries rise at that point, but only a little. After that, it’s all over the place.



