The Power of Diversification
Not everyone believes in Walt Disney's first rule of business that "the customer is always right." At least one point in everyone's life, there will be a situation where they aren't happy with their customer service, and the company just wont care. The reason often boils down to that you're one customer and they have millions.
The reverse happens at work, where your boss is really your customer paying for your services. Often people feel that their boss-customer has too much power and exploits their labor. The reason for this is that you only have one boss and your boss can find thousands of other people providing the same service.
These situations are described as the little guy being pushed around. What makes a little guy little, and how can you become a big guy? The answer is manipulating diversification. As I wrote about in An Argument against Diversification: Pareto Principle, people worry too much about diversifying their portfolio when they need to focus on diversifying their income.
People should try to smash the Pareto Principle as much as possible in their life. Instead of having 80% of your income (typically more) come from one employer, attempt to have no source of income be more than 20% of the total. Now, I'm not saying you have to take five 40hour/week jobs, but you will have to do more work.
The flip side to this is when you purchase services from a company, pick smaller companies. If you can provide 20% of their income, you're in a very powerful position. Of course I suggest that you use this power to build a relationship. Sure, not shopping at Walmart may cost you more, but you're also paying for better treatment.