It's the objection I hear most often, and it's a fair one: if I put used product on my floor, won't customers just buy the cheaper used version instead of the new one I make real money on? Won't I be competing with myself?
It's the right worry to raise. It's also, most of the time, backwards. Here's how to think about it clearly instead of letting the fear make the decision for you.
Cannibalization vs. incrementality
Two things can happen when you add used. Either a customer buys used instead of a new item they would otherwise have bought (that's cannibalization, a real sale you lost), or a customer buys used who was never going to buy that item new in the first place (that's incremental, a sale you'd have had no other way). Every used transaction is one or the other. The whole question is which one dominates in your store. For most independents, the answer leans hard toward incremental.
The used buyer usually isn't your full-price buyer
The person shopping your used rack is, more often than not, price-sensitive in a way your full-price customer isn't. They were never going to pay new-goods money for that item. If used weren't there, they wouldn't trade up to new, they'd walk out, or buy secondhand somewhere else entirely. Selling them a used piece isn't a lost full-price sale. It's a sale you'd otherwise have handed to a resale platform or a thrift store down the street.
Meanwhile, used pulls in people who wouldn't have come through your door at all: bargain hunters, treasure seekers, younger customers building toward your brand. Some of them convert to full-price buyers over time. You've widened the top of your funnel, not split your existing one.
Used isn't splitting your funnel. It's widening the top of it.
Trade-in flips it entirely
If you run used as a trade-in program, the cannibalization worry doesn't just shrink, it inverts. A customer trades in their old item for store credit and applies it to something new. You've just used secondhand goods to drive a full-price, higher-margin sale you might not have gotten otherwise. That's the opposite of cannibalization: used becomes the on-ramp to new.
When cannibalization is real
Be honest about the exception. Cannibalization does happen when your used and new assortments overlap heavily and target the same customer, especially if the used version is close enough in condition and the price gap is wide. If you're selling nearly-new product that competes directly with your current-season new stock for the same buyer, some substitution is real. Even then, it's usually manageable, and often still net-positive once you count the incremental traffic and the customers you keep from shopping elsewhere.
Don't guess, measure
The good news is this isn't a matter of opinion. You can watch what actually happens to your new-goods sales after you add used, track whether used buyers are new faces or existing full-price customers, and see whether trade-in credit is flowing back into new purchases. The data tells you which effect is winning, and it usually tells a more encouraging story than the fear did.
Funkhouser Strategy helps independent and mid-market retailers make the calls that move the P&L, resale included, with senior operator judgment and no vendor agenda.