Based on details in the passage what is steinbeck most likely trying to achieve by including this interculary chapter

If you are referring to The Grapes of Wrath, ''And the migrants streamed in on the highways and their hunger was in their eyes, and their need was in their eyes. They had no argument, no system, nothing but their numbers and their needs. When there was work for a man, ten men fought for it-fought with a low wage. If that fella work for thirty cents, I'll work for twenty-five. If he'll take twenty-five, I'll do it for twenty '', he was carrying the theme of the migrant worker's desperation for work beyond the scope of the Joad family.