Some research indicates that gift-giving evolves as a form of social expression. It is more exchange oriented (instrumental) in the early stages of a relationship (where we keep track of exactly what we give and receive to be sure we’re not getting ripped off), but it becomes more altruistic as the relationship develops.
Every culture dictates certain occasions and ceremonies to give gifts, whether for personal or professional reasons. The birthday gift ritual alone is a significant contributor to our economy. Each American on average buys six birthday gifts a year – about 1 billion gifts in total. Business gifts are an important way to define and maintain professional relationships.