What is ma's big disappointment the first day the family picks the peaches?

The conditions at the Hooper Ranch are worse than those at the government camp, but still more manageable than they could be. The Joads have a roof over their heads and are paid sufficient wages. However, the store owned by the ranch artificially raises prices for items, for it is the only nearby store where the workers can buy groceries, and the wages are high initially only because of a strike. Ma Joad makes the significant observation at the grocery store that it is only the poor who will help out other impoverished people; the clerk at the grocery store will help her, but the owners of the grocery store will exploit the workers through inflated prices.