Did barbara achieve her purpose in the first two chapters in Nickel and Dimed?

I think she uncovers many dark realities of the working poor but there is still more themes for her to explore. She discovers that minimum wage jobs pay low across the board. Supply and demand seems to have little to do with low-end wages. She also learns that it is difficult for workers to move even if they wanted to because they live from paycheck to paycheck. She still is yet to discover the insidious practice of surveys that companies use to weed the most vulnerable people out of the low wage job market.