It's not a $0.01 underbid anymore. Here's the new pattern.
The classic underbid is dead. Competitors don't drop their list price by a penny anymore — that's too visible, too easy to detect, and triggers your repricer. The new trick is more subtle: the phantom undercut.
How it actually works
Instead of dropping the listed price, a competitor adjusts shipping or applies a coupon at checkout. The price you see on the search page stays identical to yours — but the all-in price the buyer pays is $1.50 lower. eBay's buy box algorithm sees the lower total and shifts share.
$0.00
Avg. visible price gap
−$1.40
Avg. all-in gap
+22%
Buy box shift in 7 days
What to do
Three responses that work
- Move some of your margin into free shipping — buyers feel it more
- Add a 5% coupon on items losing buy box (visible badge, big psychological lift)
- Track competitor all-in price weekly, not list price daily
"Phantom undercuts are designed to be invisible to repricers. The fix is to look at total cost to buyer, not list price."
