[Solved] The difference between the highest amount a buyer would be willing to pay for a good and the amount she actually pays for it is A) producers' surplus. B) consumers' surplus. C) marginal revenue. D) marginal utility. Adolescents: Young people in the transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood. Precocious Puberty: The onset of puberty occurring at an unusually early age, often defined as before 8 in girls and before 9 in boys. Sexual Activity: Behaviors associated with the expression of sexuality and erotic desire, including intercourse and other forms of physical intimacy between individuals. Adolescence: The transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood.