What does Marta represent?

In "The Falling Girl," Marta is a young nineteen-year-old girl that represents a progression through life, and her fall represents expectations of society. As she falls, she rises in society until she reaches the lower levels. Marta begins the story as a young girl and ends as an older lady. This part of the story seems conventional. However, consider the time of day in which the story begins and ends. Dawn would normally be associated with a beginning and dusk with an end. This is not the case in "The Falling Girl." The author flips some of our expectations as readers. For example, Marta is nineteen when she begins her fall, and she sees "the city below shining in the dusk." Marta ages as she falls, and as she nears the street level, it is early in the morning.
The author shares that "flights of that kind" are not a rare occurrence in the skyscraper. People pay more to live in the upper floors so that they can see the beautiful girls fall. Near the bottom, the tenants are denied the privilege of the youthful falling girls, but they do get to "hear the thud when they touch the ground." This is a reflection on society. As Marta falls, she notices that girls dressed more beautifully are falling faster. The author refers to a "contest." Marta feels that they will reach the target before she does. This represents the race for the top in society. However, in Marta's case, it is a race for the bottom as she falls.