Brands that have the least depreciation

I'd second McIntosh and add any vintage Thorens.

Emotiva Amplifiers 

I believe, it depends on the market value of each country. In here, ARC, Wilson, Jadis, in other country, depends on the market demand. 

I have bought and sold quite a few pieces over the years. I don’t buy very many brand new components. The problem with doing it this way is I’m unable to audition various pieces with my gear. Therefore, when I get something that doesn’t work, like a wyred4sound integrated a few years back, I’ll need to resell it. I have learned to stick with name brand equipment so if I do need to sell, I won’t lose money. So, akg_ca, let me answer objectively.
Components, McIntosh
Cables, Kimber
Speakers-vintage JBL

 One brand that does not seem to hold it’s value that I don’t quite understand is Concert Fidelity. In particular, the preamplifiers and amplifiers are superb reference level pieces of equipment. I am not sure if it is the lack of name recognition or advertising?