People in the car

It is close to Christmas Day,many shopping mall are on discount.Every family is preparing for the holiday,people who  comes from different countries are going to the fifth avenue of manhattan for shopping.Oneday,three young women are on the same way to the city,they talk about the biggest discount of shopping centers.They did a list for each thing before they came here,then discuss their own plans.It's a common way for women to get close.The time passed quickly,when the car stopped at a gas station,a man get on the car.How strange it is,who is he?what's he doing here?The man told that he just want to do a research about the option of consumption.