In a sentence like 可以便宜很多吗 or 可以便宜一点儿吗, what part of speech are 多 and 一点儿? I know what these sentences mean, I just don't know whether 多 and 一点儿 nouns, adverbs, or adjectives in this context.
They seem adverbial, but I'm not aware of adverbs modifying adjectives. That suggests they act more like degree words or degree complements of some kind for adjectives. If they're adverbs, could someone provide example sentences with the same grammar, but not in a 可以~吗 format?
My other hypothesis is that the phrases above are comparisons with one side of the comparison understood and unspoken, in which case I guess it's the same as a comparative sentence with 比, where the adjective comes at the end, so 多 and 一点儿 would be adjectives.
The only other thing I can think of is that the adjective 便宜 is serving as a noun, and the sentence is just like any other Noun + 很 + Adjective phrase.
I'm mainly trying to figure out if there's some underlying grammatical rule that forces 多 and 一点儿 to the end so I can build a formula with parts of speech. The grammar wiki says here that 一点 just can't be used before an adjective and should instead be used after, but that wouldn't apply to 多, which seems to work the same way in the two examples above.