What license do you need if you want to be able to sell to retail customers dealers and at auctions?

To sell to retail customers, dealers, and at auctions, you typically need a retail seller's permit or a sales tax permit, depending on your state or country. Additionally, if you are selling certain regulated items, such as vehicles or firearms, you may require specific licenses or permits related to those goods. It's important to check local regulations to ensure compliance with all necessary licensing requirements.