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Please look at the following sentences.

[1] The prices of products in our stores are much expensive than in our competitors' stores.
[2] The prices of products in our stores are much expensive than those in our competitors' stores. ( I normally use this expression)
[3] The prices of products in our stores are much expensive than our competitors.
[4] The prices of products in our stores are much expensive than those in our competitors' stores are.

Is every sentence above okay?

Thank you for your answer in advance.
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The basic idea is this.

A price is higher than another price.
A product is more expensive than another product.

Clive
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Ah~ I see. I just think I can use both of "higher" and "more expensive" to either a price or a product. I've found it is not like that.Thank you so much,Mr.CliveEmotion: embarrassed By the way, If I change to "higher" in all of the sentences above, will they be right in grammar? Thank you for your answer in advance.
Aside from missing the word "more" between "much" and "expensive", each of these sentences are more or less acceptable, the only sentence I would say is completely grammatically correct would be #2.
Oh~ Thanks to your indication I just before found I missed "more" there. Thank you so much,Mr.PsychowordEmotion: embarrassed
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