Adam Smith and the founding group of the United States were all philosophically opposed to inheritance, and very in favor of estate taxes, estate taxes being very very compatible with capitalism:

http://www.economist.com/blogs/lexington/2010/10/estate_tax_...

If there was one thing the Revolutionary generation agreed on — and those guys who dress up like them at Tea Party conventions most definitely do not — it was the incompatibility of democracy and inherited wealth.

With Thomas Jefferson taking the lead in the Virginia legislature in 1777, every Revolutionary state government abolished the laws of primogeniture and entail that had served to perpetuate the concentration of inherited property. Jefferson cited Adam Smith, the hero of free market capitalists everywhere, as the source of his conviction that (as Smith wrote, and Jefferson closely echoed in his own words), "A power to dispose of estates for ever is manifestly absurd. The earth and the fulness of it belongs to every generation, and the preceding one can have no right to bind it up from posterity. Such extension of property is quite unnatural." Smith said: "There is no point more difficult to account for than the right we conceive men to have to dispose of their goods after death."

The states left no doubt that in taking this step they were giving expression to a basic and widely shared philosophical belief that equality of citizenship was impossible in a nation where inequality of wealth remained the rule. North Carolina's 1784 statute explained that by keeping large estates together for succeeding generations, the old system had served "only to raise the wealth and importance of particular families and individuals, giving them an unequal and undue influence in a republic" and promoting "contention and injustice." Abolishing aristocratic forms of inheritance would by contrast "tend to promote that equality of property which is of the spirit and principle of a genuine republic."

Others wanted to go much further; Thomas Paine, like Smith and Jefferson, made much of the idea that landed property itself was an affront to the natural right of each generation to the usufruct of the earth, and proposed a "ground rent" — in fact an inheritance tax — on property at the time it is conveyed at death, with the money so collected to be distributed to all citizens at age 21, "as a compensation in part, for the loss of his or her natural inheritance, by the introduction of the system of landed property."

Even stalwart members of the latter-day Republican Party, the representatives of business and inherited wealth, often emphatically embraced these tenets of economic equality in a democracy. I've mentioned Herbert Hoover's disdain for the "idle rich" and his strong support for breaking up large fortunes. Theodore Roosevelt, who was the first president to propose a steeply graduated tax on inheritances, was another: he declared that the transmission of large wealth to young men "does not do them any real service and is of great and genuine detriment to the community at large.''

In her debate in Delaware yesterday, the Republican Senate candidate Christine O'Donnell asserted that the estate tax is a "tenet of Marxism." I'm not sure how much Marx she has read, but she might want to read the works of his fellow travelers Adam Smith, Thomas Jefferson, Thomas Paine, Herbert Hoover, and Theodore Roosevelt before her next debate.