Correct grammar

cheaper

more

You are only contrasting two objects. More than that and you'd be wanting to use the other options.

Cheapest and most

GuestWhich is the correct grammar in this sentence:
As both products are good, order the cheaper/cheapest one from the more/most competent of the two clerks.

what makes you think one way is correct and the others incorrect?

sam

0Sohy is correct. A comparison between two uses cheaper, a comparison between three or more uses cheapest.02br
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00Similarly, if I say "my older sister", I mean I have only one sister and I am younger than two. If I say "my oldest sister", I mean I have more than one sister and I'm referring to the one born first.0-

0I think it should be "elder"/"eldest" instead of "older"/"oldest". Please correct me if I'm wrong.0-

0 Hmmm. As a native British speaker, "older sister" is what comes out instinctively here, but I realise 'elder' is more grammatically correct in this context. Sorry to confuse things - that was a poor choice of example on my part. 0-

0 Hi all02br
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00British: 01i00my elder sister02i02br
00American: 01i00my older sister02i02br
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00Cheers02br
00CB0-

0I have to agree with Lil RR02br
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00Although 'elder' is officially correct, most people here would say 'older'. Actually, most of us would say 'big sister' and I would be her 'little sister'.0-

0Thanks for the clarifications.02br
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00I've one more question. Is it idiomatic to say:02br
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00He has one eldest brother, one eldest sister and one youngest sister.02br
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00My intention is to make the reader aware of the rank of the siblings.0-