Directionality Explained

djones51,

"...if I rip the wire out of my wall and reverse it instead of reading 121 volts as it does now it's going to read what?"

That is easy. It will read exactly 121. 121 is 121 going backwards. So, you are safe.

Or it will read 120.99999999.....

Or it will read 120.99999999.....

No way. It would mess up Poynting vector and that is a big no-no.

Hee hee hee, Ha ha ha, Ho ho ho,
I'fn y'all, "Audio Cable, directionality Doubters" are really going to keep arguing a point which has already been made countless times then I just  have to ask.
Why?

I mean, If you cannot hear a difference for "whatever", reason. But you can still actually prove it to yourself by measuring the fact that there is a voltage drop. "There is ALWAYS a voltage drop". And the direction of the cabling should always be in the direction of the "Lesser" of the two values "Voltages", derived by simply measuring it. And this can be done with a simple "Multimeter". 
WHY? Why are you guys still spouting a belabored, "We don't get it"? 
I mean, You cannot be saying you do not "Believe' it at this point. 

Because If you are? You are saying also "Basically", that you do not believe in "Basic Arithmetic",  as well....