How does this chapter emphasize the theme of human endurance?

Steinbeck exposes several additional frauds in the farming system. The owners who hire the cotton pickers seem intent on making sure that the pickers receive less compensation than they deserve, and place them in debt initially by making them pay for cotton bags beforehand. The system is made to maximize profit, no matter the cost to the worker. The only solution that the workers have is confrontation: they must stand up to the men who weigh the cotton to ensure that they are paid fairly. Still the workers work because if they don't their families will starve. They endure to live.