Assume your are selling a product on both own webstore and marketplaces like eBay.

The marketplace will insert a canonical link in your product page on its sites. So far I know, one can't do anything against this.

To give more weight to one's own webshop, can we (--and should we?--) suggest to search engines that the matching marketplace listings are in fact alternates of the products listed on own website?

Strangely, I could not find any answer, nor A/B testing about this question.

Example: The product is

  • listed on own webshop
  • listed on eBay.com
  • not listed but visible on eBay.de

Existing canonical links

  • on own webshop:

<link rel="canonical" href="https://www.some-webshop.com/The-Product-Title" />

  • on eBay.com:

<link rel="canonical" href="https://www.ebay.de/itm/The-Product-Title/123456789012" />

  • on eBay.de:

<link rel="canonical" href="https://www.ebay.com/itm/The-Product-Title/123456789012?_ul=CC" />

where CC is the sellers's country code (e.g. FR for France).

Alternate links on own webshop (Good or bad idea? Would this push even more traffic to eBay?)

<link rel="alternate" href="https://www.ebay.de/itm/The-Product-Title/123456789012" />
<link rel="alternate" href="https://www.ebay.com/itm/The-Product-Title/123456789012?_ul=CC" />

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