What do you mean, I don’t understand
The setting of the story is 1920s Spain, and the events take place in a train station between Barcelona and Madrid. The description of the physical setting mirrors Jig's thoughts and dilemmas about having an abortion. The social setting is focused on relationships and identity.
The first purpose that Richard's soliloquy appears to serve is to reveal the motivations and personality of the character - we can see that he hates himself because he was basically a hunchback, so he was pretty self-conscious about it. He also reveals in the first scene what he intends to do throughout the play.
As for the second purpose, I'd choose the answer - it informs the audience about the background of the plot, as it gives us reasons why Richard decided to do what he did.
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