The DH was implemented in the American League in 1973 with the stated intention of increasing offence. Unlike most of major-league baseball’s innovations, this one actually worked, kind of. Scoring, which had been in the doldrums, perked up: the AL’s collective batting average rose 20 points, and the AL has outscored the NL in runs per game in 31 of the 32 seasons that followed (interestingly, the NL actually outscored the AL by 0.05 runs per game in 1974, the year after the DH’s introduction).
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