Who is Marta from Sudden Fiction International: Sixty Short-short Stories and what is their importance?

Marta begins The Falling Girl by looking over the side of a skyscraper and leaping. She is a young, lively girl, and there is a party on the first floor. As she falls past the upper windows, young men beg her to stay, but she politely declines. As she falls farther, she passes hard-working people who pay no attention. As the sun sets and Marta nears the ground, she grows tired and feels older. She notices younger, prettier girls falling faster to the part below. By the time Marta reaches the lowest floors, an old couple is commenting how tired and old she looks.