As a marketing technique, the free sample has a long and effective history. In most instances, a small amount of the relevant product is given to potential customers to see if they like it. Certainly this is a legitimate desire of the manufacturer—to expose the public to the qualities of the product. The beauty of the free sample, however, is that it is also a gift and, as such, can engage the reciprocity rule. In true jujitsu fashion, a promoter who provides free samples can release the natural indebting force inherent in a gift, while innocently appearing to have only the intention to inform.