The commission you can earn from affiliate marketing varies depending on the merchant and the product.  The commission rates can range from 3% to 30% of the sale price.  For example, Amazon’s affiliate program allows you to earn up to 10% in advertising fees by promoting Amazon’s products.  
eBay’s affiliate program allows you to earn commissions by promoting eBay’s products.  Shopify’s affiliate program allows you to earn up to $2,000 per new merchant referral.  According to Glassdoor data, UK affiliates earn roughly £34,000 per year.
I hope this helps! Let me know if you have any other questions. I can help you get started with Affiliate Marketing if you like.
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