How does Ma respond to Tom's fear that there are too many people looking for work in California?

From the text:

"Tom watched her working, and his eyes smiled. "It done you good jus' thinkin' about it. I knowed a fella from California. He didn't talk like us. You'd of knowed he come from some far-off place jus' the way he talked. But he says they's too many folks lookin' for work right there now. An' he says the folks that pick the fruit live in dirty ol' camps an' don't hardly get enough to eat. He says wages is low an' hard to get any."

A shadow crossed her face. "Oh, that ain't so," she said. "Your father got a han'bill on yella paper, tellin' how they need folks to work. They wouldn't go to that trouble if they wasn't plenty work. Costs 'em good money to get them han'bills out. What'd they want ta lie for, an' costin' 'em money to lie?"