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In the phrase “baker’s dozen”, why does the apostrophe indicate possession of a (single) baker? Shouldn't it indicate possession of all bakers in general? Shouldn’t it be “bakers’ dozen”?

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Oddly, while "baker's dozen" is always written that way, "banker's rounding" is also written "bankers' rounding". "Farmers market" is written three different ways. – David Schwartz Apr 21 '12 at 1:10
To heck with English; just use Japanese. それじゃ、ベーカーのダ―ス。(Soreja, beekaa no dasu.) "Now then, baker's dozen." It could mean bakers' dozen too. Or bakers' dozens. Problem solved. :) – Kaz Apr 21 '12 at 6:01

Because the dozen isn't the collective property of all bakers, but of a generic baker. It's the same reason it's a carpenter's square, a driver's license, or a greengrocer's apostrophe.

You see both farmer's market and farmers' market because there are several farmers selling at a farmers' market, so you can also think of it as a market that collectively belongs to these farmers.

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It is a particular "dozen" of a particular person, an individual baker — it is the "dozen of a baker," 12+1 items. The phrase is not about a group of bakers coming together to count out a dozen, or about the total number of "dozens" of the n bakers in existence, which would be (12+1)n items.

I have heard the label genitive of source applied to this construction; the 's indicates an origin or dependency which affects the meaning of the phrase. It is actually quite common in English: we may say it's a man's world but never it's a men's world, even though the former could be interpreted as saying the world belongs to an individual man. Consider expressions like soft as a baby's bottom (not babies' bottoms) or rare as hen's teeth (not hens' teeth). We wear soldier's caps, collect a day's pay, and live a dog's life.

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If you know the origin of the expression you realize that the "dozen" belongs to the occupation of being a "baker" rather than to an individual baker.

So "A baker's dozen" should be understood as A + (baker's dozen) where "baker's dozen" is seen as an expression meaning thirteen rather than as (A baker)'s dozen.

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It refers to a particular baker. Since we are concerned with 12+1, the collectivity of bakers is not important so we start with the origin which is one baker.

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