Interconnects, some have directional indicators, why?


I'm curious as to why some interconnects are directional? Is there a physical internal difference and do they generally sound better and cost more than non-directional cables? Thanks for your interest.
phd
Thanks posters. For the most part this is a very nice civil, well mannered discussion that everyone can share some sincere views without attacking. 
It makes it informative and pleasant at the same time.  For me anyway. Thanks to you good posters. 
If this whole site could just stay that way.  
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The fuse is a weakest link. In a garden hose, only narrowest part of hose counts to pass the max water. A weakest link is very sensitive. What has happened in the weakest link is amplified huge later. A sound system is only as good as its weakest link.

You are still thinking current flows through the fuse. It does not. You cannot use the garden hose analogy when describing what goes on with the workings of a fuse. Weakest link? Yes, only because if more energy passes through the fuse than it is designed to handle it will melt the link and open the circuit. Does the fuse restrict/limit the amount of energy needed for the piece of equipment to operate as designed?  Good question..... My guess is no.

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