Mariana Has a Preference for Exquisite Handcrafted Jade Ornaments Imported

Mariana has a preference for exquisite handcrafted jade ornaments imported from Japan.She displays her possessions at social gatherings and feels proud when her friends compliment her on the same.When approached by her friends for the source of these ornaments she indirectly refuses to reveal it by diverting the conversation to other things.She feels that once her friends start purchasing similar ornaments the exclusivity of her collection will be lost.Explain Mariana's behavior within the context of the demand theory.