In term of construction, what's the difference between cheap vs. expensive power cables


When it comes to interconnects and speaker cables, it is easier to understand the justification for the costs of these cables.  But when it comes to power cables, it is a little difficult to understand.

Some believe that as long as the power cable has enough gauge the that's all you need.  I've used some cheap power cables vs. some high price cables and there are clearly differences in sound, so the "gauge" of the cables is not the ONLY thing and it's a little bit more complicated than that.  

In speaker cables design, you can adjust the R/L/C parameters to achieve a certain kind of sound and it's easy to visual how these parameters will affect the sound.  For example too much C then the sound will lack leading edge.  Too much L then the sound will be brittle.  If too much R then the sound will lack dynamic.  Or if the cable has too much jitter, then the transparency will be affected.

But the power cable main job is to establish a DC source, it's not too clear how the R/L/C parameters will affect the sound the same way these parameters will affect the sound of the speaker cable.  Also I am not sure how jitter would affect a power cable either

So the bottom line is what's actually inside a power cable that make them so expensive?  Do they use fancy dielectric?  How about construction geometry?  

For a designer, I mean how do you fine-tune your power cable.  How do you know your power cable will sound good?
andy2
https://forum.audiogon.com/discussions/extra-extra-millercarbon-proven-wrong-read-all-about-it-extra...

Please read the last post. You can wrack your brain trying to understand why. Or you can accept what is, and move forward. Denial, or acceptance. The choice is yours.
The sound of any electronic component starts with its power supply. NOT with what comes before it! A power cord is NOT part of the power supply! Contrary to what the deluded believe!
I used ordinary 14 gauge lampcord to connect my Quad 57's to the wall AC - for 19 years when I stupidly sold them! No problems noted!
"Audiophile" power cords are a clever marketing ploy to profit from the gullible and deluded! 
Here’s some explanation: "There’s already enough controversy over power cable quality vs. sound quality and now this question has Paul explaining not only why power cables can make a difference but their actual construction and discovery."
PS Audio (153K subscribers) https://www.youtube.com/watch?v=8QuToO9JUfw&ab_channel=PSAudio

The challenge of understanding the mechanics of power cables and audio is nothing compared to understanding the psychology of denial. For those on the fence between learning a little bit and trying a power cable for yourself vs. going down the feral path of conspiracy theories, why not just be honest and admit that you just don’t want to spend the money and move on? If you try it and hear nothing, you get your money back. The danger is that you'll hear something and be out a few hundred bucks. If you don't want to spend that, then it's just much simpler to live with an economic argument based on frugality than on the notion that there's a conspiracy to defraud people of their money. Real frauds don't have return policies.