Race to the Bottom
When multiple sellers with similar items keep undercutting each other's prices, driving margins toward zero. Most visible on eBay for common items. Avoid by differentiating your listing or moving to a less crowded platform.
Where you'll see this
This term is commonly used on:
ebay
Put this into practice
Shopfront handles the hard parts of crosslisting and inventory sync so you can focus on finding and selling.