Wal Mart is not the only megastore out there. There is such a thing as Target, so I disagree that it is a Monopoly.
If the workers accept the treatment they get from Wal Mart (hiring on everyone as part time to avoid benefits, which is becoming common across the board) then they deserve it. If the abused masses of Wal Mart workers really wanted change within the company then they could affect it. That they don't is just an acceptance of the status quo, and generally lazy of them. Change can happen, but only if you get up off your ass, stop complaining, and start working towards an acceptable business model.
Wal Mart may be the largest retailer in an area, but it is most definitely not the only place people can shop by any means.
I honestly am surprised you're comparing Wal-Mart to Target. Target doesn't have two-block superstores that sell food.
The workers don't really have a choice for change. Consider the following scenario. Wal-Mart moves into a neighborhood and starts selling food to compete with the local Albertson's. Cashiers at Albertson's that were getting a union wage of $15 are all of a sudden laid off because Albertson's can't compete. What do these people do? Surely you don't suggest they rely on their other marketable skills and get a computer programming job? To suggest that they are really in control here diminishes how powerful Wal-Mart is. In the above example, those cashiers only have training as cashiers. Guess what? They're forced to work at Wal-Mart for crappier pay, because hey.. it's still a job and it's better than unemployment.
It's not just the Wal-Mart workers -- there's a fallout effect. In the above example, suppose that local Albertson's was in a shopping center (as many supermarkets are). Now, with reduced traffic to Albertson's, the local mom-and-pop stores also in that center receive less traffic -- some of them are forced to go out of business.
And I'm not just talking about hiring people part time. There are stories from ex-Wal-Mart workers who tried to unionize their store and were treated harshly. Would you, as a manager, deny bathroom breaks to someone who tried to unionize your store?
People don't think Wal-Mart is a monopoly because it has such low prices. I ask those people: ever stop to think about how Wal-Mart became the largest single retailer in the world with such low prices?
They don't just pinch their workers either -- they pinch from the other end. Suppose an oscillating fan sells wholesale for $10. Other stores pay that price and sell the fan for $15 retail. Wal-Mart comes in and tells the wholesalers: I want to purchase that fan for $7. Most wholesalers balk, but there's always at least one who agrees. Wal-Mart gets the fan for $7, sells it for $10, still makes a profit. That wholesaler who took the deal because Wal-Mart is such a huge source of business then has to do things like ship HIS workers' jobs overseas so HE can make a profit off the fan sale.
To suggest it's simply a matter of whiny workers getting off their asses truly shows a lack of understanding of this whole situation.