Why was Ponyboy a greaser?

Ponyboy Curtis is a greaser in the novel "The Outsiders" by S.E. Hinton because of his socioeconomic status and his association with the greaser gang.

Here's a breakdown:

* Socioeconomic status: Ponyboy is from a poor family living in a rough part of town. He and his brothers struggle financially and are often seen as "lower class" compared to the wealthier Socs (Socials).

* Gang Affiliation: He is a member of the Greasers, a gang of working-class boys who are defined by their style (long hair, leather jackets) and their defiance against the social hierarchy.

Essentially, Ponyboy is a greaser because he fits the social and economic characteristics associated with the Greasers in the novel. It's a label he carries due to his circumstances and his chosen community.