Wages [have] increased somewhat throughout the mid-to-late 90s, but as the supercharged growth gave way to the robust numbers of the past few years, the rich began sucking up the gains… The left has tried to explain this away as a consequence of Bush's fiscal policy. Sadly, the trends show up in pretax income also. The right has tried to explain this accelerating inequality as an unstoppable structural feature of the new economy: It's the meritocracy, or computers, or benefits, or global trade. Unfortunately, those explanations are largely bullshit. Europe also has computers, and trade, and mobility, and benefits, and has easily avoided the widening chasm we've seen. So what makes us different?I’ve heard the idea bandied about that money and political power are fungible, which I’ve come to believe is largely true. Political power and money tend to show up at the same parties together because most of the time money simply means control over things (“possession is 9/10ths of the law”) and other people’s time and activities, whereas political power means formal control over the semi-rigid social systems which hold people together. In this context, they’re both just different angles for exercising influence over social processes and outcomes. But there are plenty of other forms of social control as well—for example: money, political power, religious zeal, moral authority, et al.While control over social systems is absolutely crucial, an overabundance of it in the hands of too small a group of people results in a kind of ossification. A society can become inflexible, even frangible.
In a word, power. Or the distribution of it… We used to think the country's economic problems were about economics. At times, that's been true, It isn't now. Now, they're about power.

Joseph Keppler, Bosses of the Senate (1889), NPR, 29 Oct. 2006
We need power, but the distribution of power over a variety of forms (financial, political, religious, etc.) permits for relative change. One aspect of society can shift radically while the others try just to hold thing together; or several can change somewhat while the others maintain basic functions. The greater the diversity of forms of power, the more systemically resilient is the society.
But forms of social power operate as different forms only when they’re held by different people or groups. It’s not enough to distinguish between political and financial power. Only to the extent that they’re held by different groups of people (even if their interests align often) are they effectively different. Forms of power are fungible in terms of one another to a certain extent, and that means that where people who have less money want more, they can only get it by trading on a certain balance of some other form of power. The whole point of a democracy, as I understand it, is to ensure that every citizen has at least his vote as a potential seed for acquiring greater control over his destiny.