performance. This approach, first used by Oakland Athletics’ GM Billy Beane and his assistant
Paul DePodesta led the Oakland Athletics to high winning percentages despite the team’s low
payroll by analyzing statistics about a player’s walks and on-base average, rather than what
traditional baseball scouts could see with their own eyes. Small-market teams can only afford
one-tool players. According to the moneyball approach, the most efficient way to spend money
on baseball players is to spend it on hitters (Lewis, 2003). Eric Walker (as cited in Lewis, 2003),
a former aerospace engineer turned baseball writer, wrote that fielding was “at most five percent
of the game” (Lewis, 2003, p. 58). The rest was pitching and offense (Lewis, 2003). At the
time, good pitchers were usually valued properly while good batters were not. Lewis (2003) cited
Walker as having stated, “[The] most critical number in all of baseball is 3: the three outs that
define an inning. Until the third out, anything is possible; after it, nothing is” (p. 58). He went
on to explain that the goal of an offense is to decrease its chances of making an out and that on-
base percentage is an isolated, one-dimensional offensive statistic that measures exactly that: the
probability that the batter will not make an out and will not put the team closer to the end of the
inning (Lewis, 2003). This simple observation was overlooked by almost all general managers
in MLB at this time. GM’s also tended to overvalue RBIs, the runs batted in statistic. RBIs were
treated as an individual achievement. However, in order to hit runners in, there must be runners
on base when a player comes to bat. A player’s ability to hit base runners in and receive credit
for an RBI, is heavily based on the achievement of others and/or luck. Bill James, an American
baseball writer and statistician, explained that the RBI statistic, among other baseball statistics,
“are not pure accomplishments of men against other men,” but “they are accomplishments of
men in combination with their circumstances” (Lewis, 2003, p. 71). General managers in MLB