por mí vs. para mí

Question

I'm learning the difference between por and para. The teacher told me if I want to express my opinion, I need to use "para mí." But I found an example sentence in SD--"por mí puedes ahorrarte las molestias (as far as I'm concerned you can save yourself the trouble)". Why does this sentence use por mí instead of para mí?

Thanks for asking joygogo. - 0095ca4c, Sep 26, 2013

good question - rogspax, Sep 26, 2013

Answer 1

[Revise my English, please]
I would say we use por mí because there is no rule without an exception. As you said, its meaning is as far as I'm concerned but it has a nuance of I don't care if... That is:

• Por mí puedes ahorrarte las molestias = I don't care whether you do it or you don't. Or
• Por mí como si se matan entre ellos = I don't care if they kill each other.

I think that por mí might be short for por lo que a mí respecta which is another way to say as far I am concerned.

Oh, l see. That makes much sense. Many thanks for your good explanation. - joygogo, Sep 27, 2013