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> シェア型【がた】本屋【ほんや】では、棚主【たなぬし】は自分【じぶん】で本を持【も】ってこないといけないし、店番【みせばん】だってある([source](https://www.asahi.com/articles/ASPD45RT6PCVUTIL023.html?iref=comtop_Culture_04))  
>  _In a shared bookstore, the shelf owners have to bring their own books, and
> they also have to guard the store._

The idea of a "shelf owner" is a concept too new for dictionaries, apparently.
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question
readings neologism
Is the reading of 棚主【たなぬし】 or perhaps 棚主【ほうしゅ】?
I think most people would read this as たなぬし using the kun-reading. The biggest
reason is simply because the on-reading of 棚 is little-known.

I also feel たなしゅ is unlikely. Among the words that end with 主 meaning _owner_
, there are kun-kun compounds (宿主【やどぬし】, 生主【なまぬし】, 家主【やぬし】), on-kun compounds
(馬主【ばぬし】), and on-on compounds (店主【てんしゅ】, 社主【しゃしゅ】), but I cannot think of
kun-on ones.
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answer