Is it possible for a seller to sell wholesale to businesses and retail to consumers

Your sellers can cater to both retail and wholesale buyers by registering on your platform and listing their products as they choose.

By default, the Multivendor Marketplace app operates as a retail marketplace. However, if you want to support a wholesale marketplace, The Marketplace app offers features that allow you to enable sellers to set a minimum order quantity. This allows them to offer bulk pricing while still selling to individual consumers.

• Minimum Purchase Amount: Sellers can specify a minimum order value that a customer must meet to proceed to checkout.
• Customer Restrictions: You can restrict purchases for specific customers based on the tags assigned to them, ensuring that only eligible buyers can place wholesale orders.

For more details, please refer to this guide below: 

Slot Pricing: https://webkul.com/blog/shopify-multivendor-marketplace-slot-pricing/#minimum-purchase-amount-for-orders

Minimum Purchase Amount: https://webkul.com/blog/shopify-multivendor-marketplace-slot-pricing/#set-a-minimum-purchase-quantity-for-each-slot-per-product