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Looking up ある程度 on Weblio [yields a lot of
phrases](http://ejje.weblio.jp/sentence/content/%E3%81%A7%E3%81%82%E3%82%8B%E7%A8%8B%E5%BA%A6)
like

`Xである程度` --> to the extent that something is X

is this to be understood as **`Xである 程度`** or **`X で ある程度`** ？

I don't know if this is a set phrase or not, but what is the function of the で
in this? Is it で、as in です's て-form, or is it connected to である？

If I wanted to say a phrase like

> **The degree to which something is expensive is dependent on the market
> price**

would I say

> **高価である程度は相場に基づいている？**
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grammar translation set-phrases
Nである程度 ― the degree to which one is N
First "ある程度" means "on some leve or to some extent."

> "ある程度のお金を使う" = "spend a certain amount of money"

"ある程度" of "である程度" has different meaning from "(just)ある程度."

The followings are examples from Weblio,

> 頑固である程度 "the degree of obstinacy"  
>  質素である程度 "the degree of simplicity"

## "〇〇である程度" = "〇〇である。その程度(level or degree)"

> "私の父は頑固である（＝私の父は頑固だ）。"、"どの程度頑固ですか？"、”頑固である程度を説明するのは難しいが、強いて言えば「牛のように頑固だ」”  
>  "My father is stubbom." "How stuboom is he?" "It's hard for me to explain
> how stuboom he is, but to stretch a point, he is as stubbom as an ox."

Eeven through the phrase "である程度" is familiar for me, but when I try to make
examples using "である程度," I found it's difficult.

Then, the following example is natural.

> "私の父は頑固である（＝私の父は頑固だ）。"、"どの程度頑固ですか？"、”どのくらい（程度）頑固か（を）説明するのは難しい。”

Anyway, you can understand "である程度" as one phrase.
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ある程度 is a common set phrase that means "to a certain extent/amount/degree",
but it's not used in this sense in those ～である程度 examples on Weblio. They are
`[Xである→]程度`.

In general `(na-adjective) + である程度` can be translated as `the degree of
～ness`, but I think `(na-adjective) + である程度` is not common. I feel it's a bit
roundabout. For example, we usually say 危険さの程度, 危険の程度 or even 危険度, instead of
危険である程度. I don't know why Weblio has this many examples of ～である程度 even though
they are far from idiomatic.

Likewise 高価である程度は相場に基づいている sounds weird to me, and I can't help seeing the set
phrase ある程度 in this sentence (i.e, "It's expensive, and is more or less based
on the market price"). Why not simply say 値段の高さは相場に基づいている or even
価格は相場に基づいている?
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answer