I apologize if this has been discussed already, but I can't seem to find the answer by searching.

I noticed that on baseball-reference.com the league average OPS+ for all teams, combined, is often well below 100. For example, for 2012 NL the league overall OPS+ is 94.

I would have expected that the league average would be exactly 100, but maybe I fundamentally misunderstand this stat.

Could someone please enlighten me as to how this stat, ostensibly normalized to 100, would be well below 100 for the entire league?

Thanks.

I noticed that on baseball-reference.com the league average OPS+ for all teams, combined, is often well below 100. For example, for 2012 NL the league overall OPS+ is 94.

I would have expected that the league average would be exactly 100, but maybe I fundamentally misunderstand this stat.

Could someone please enlighten me as to how this stat, ostensibly normalized to 100, would be well below 100 for the entire league?

Thanks.

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