Economic exploitation crushes individuals
Banks, landowners, and labor contractors all operate on the same logic: extract maximum value from workers and discard them. Steinbeck shows this isn't cruelty — it's just how the system works, which makes it harder to fight.
Family as survival unit — and its limits
The Joads stay alive because they function as a unit. But the migration breaks that unit apart piece by piece. Steinbeck uses the family's collapse to show that no private solution is enough against a public crisis.
Solidarity versus individualism
The novel argues that the only way working people survive is by expanding their circle of care beyond their own family. Tom's transformation and Rose of Sharon's final act both point toward collective survival as the only real option.
The American Dream as a lie
California is sold to migrants as a land of opportunity. What they find is a labor trap. Steinbeck uses the gap between the promise and the reality to indict the mythology of individual success in America.
Human dignity under dehumanizing conditions
The Joads are called 'Okies,' herded into filthy camps, and paid wages that guarantee starvation. Steinbeck keeps showing moments where characters insist on their own humanity — sharing food, dancing, caring for strangers — against conditions designed to strip that away.