Retail therapy has long been a treat for millions of women who enjoy nothing better than a trawl round the shops. For those who pause long enough to wonder if it is nature or nurture which guides them, the answer may have emerged. Sales levels indicate that it is behavior that is learned, so it may be down to women's mothers that they like to shop so much. Figures have revealed that clothes for baby girls out-sell those for boys by a fifth. It emerged that by the age of four, girls have 20 percent more clothes than boys of that age. As mothers buy most of the clothes for their children, this suggests that they instinctively instill a much greater need for clothes in their daugters from a very young age. As a result, it is likely that women are brought up to love shopping through years of intense exposure to fashion and purchases.