The retailer was asking the designers to agree to Exclusive distribution.
Explanation:
Exclusive distribution is characterized as the arrangement under which a participant is a supplier and provider. It specifies that the seller can not offer their service or item to some other group. It attaches the contract that the commodity must be distributed to an exclusive seller. The retailer asks developers for exclusive supply as per the situation specified in the discussion. Retailer does not want the jewelry design to be sold to any other outlet or retailer for successful sale. Thus agreement on this matter is suggested by the retailer.