No matter if you are creating a physical or webbased marketplace, the used car market is crowded. So you need to stand out.

So you need to explain exactly what value you are creating for the suppliers. Parameters could be:
- Convenience: Easy to set up a profile or deliver your car.
- Best price: You document that you will offer the best price
- Guarantee: You will take the car off their hands without any further discussion - they are free to go with money in their pocket, and you carry the risk.
- Best presentation of the car: Great location of the shop, best looking website, most traffic compared to competitors or some other KPI that would signal, that you will get them the most exposure.
- Referrals: People who trust you with regards to selling their car, will refer their friend, if you showed them a good experience. Pay for referrals from strategically chosed friends - f.ex. from mechanics, dealers of new cars, insurance companies or similar.

Those were just af few ideas to get you started. There are similar ideas for the buyer side. I will be happy to discuss both sides of your market in a call, if you want to set it up.

Good luck with your business!

Best regards
Kenneth