Amy J's link is a comprehensive overview. http://www.youtube.com/watch?v=N8o3peQq79Q
Most of the demonstrators have trouble giving voice to specifics, beyond the particular disadvantages and social inequities they have personally experienced, and the sense that those who determine economic policies in their corporations or our government do not understand the urgency of their struggles and losses.
For some, it's having been laid off after years of dedicated work so the company can shift more profits to stockholders and CEO salaries and bonuses.
For some, it's the exporting of jobs and whole industries in the name of profit.
For some, it's the loss of a family home because of the absurd decisions of some wealthy bankers, and laws that do not protect them from improper foreclosures.
For some, it's crippling student loans after graduating into a non-existent job market.
For some, it's watching loved ones suffer or die because their insurance companies denied care or medicine.
For some, it's paying much higher taxes for actual labor than a rich investor is taxed for profiting from an investment.
For some, it's because the actions of a few bankers, operating solely for profit and personal bonuses, have destroyed the housing market and hugely affected the stock market, to which many of our retirement accounts are tied. Workers who have saved carefully for years are suddenly faced with massively-diminished retirement resources.
For some, it's the fact that some cities' police are supporting the status quo and denying protesters the right to peaceful assembly.
But the inequities are everywhere, and we can see them if we look around with open eyes. And they are part of the same fabric of inequity, which the protesters rightly argue should not be what this country is about.