Diff between RC wire and automotive wire?

[redshift]

Brian:
"because of possible skin-effect (tendency for high frequency signal to travel only on the outside of the wire)

That's what I'd always heard, but pertaining to current carrying capacity, not high freq. I'd heard that solid wire vs. stranded wire of the same gauge will not carry as much current because it's conducted on the outside of the wire, not throughout. Is that a wives tale or is that a good argument to stay away from thicker, fewer strand wire for high current?

I know that high tension lines are solid, but does the extremely high voltage offset the so-called skin effect, or is this just more bad info?