IMO it's categorically wrong to blame the Fed for this, although I see it done over and over again.. The Fed facilitates the rich getting richer, but it seems they have no choice if they are to do their job well.
This phenomenon of the rich getting richer is a fundamental characteristic of economies where the return on capital is greater than the economic growth rate. Up to a point this is a desirable feature of capitalism, but both the rate and the limits to which the rich get richer is regulatable in a way that maintains both a strong economy and a strong democracy. Central Bankers can not do this. It must be done with fiscal measures that Congress controls. Here, the United States is falling woefully short. If nothing is done to correct the faults we have introduced into our taxing system, then we should expect a continuation of the current drift toward concentration of political power, which seems to be making possible a disconnect between what people want and what government is doing in specific matters that benefit only a very few. The outcome of this tendency is never very clear, but it is generally considered to be bad thing. It leaves the fate of the people in the hands of too few powerful people who may not always have the best interests of society in mind when making decisions.
The responsibility to maintain a wise tax system is entirely within Congress's hands; not the Fed. We are in trouble because we have intentionally made political choices that have resulted in both an unwise taxing system and a dysfunctional Congress. It would seem all "-isms" contain the seeds of their own destruction. We may be experiencing the veracity of this first hand.
) is now worth more than all of the Russell 2000 companies combined. 
