There are then two provisos regarding what one can take, the "enough and as good" condition and "spoilage." Gold does not rot. Neither does silver, or any other precious metal or gem. They are, moreover, useless, their aesthetic value not entering into the equation. One can heap up as much of them as one wishes, or take them in trade for food. By the tacit consent of mankind, they become a form of money (one accepts gold in exchange for apples with the understanding that someone else will accept that gold in exchange for wheat). One can therefore avoid the spoilage limitation by selling all that one has amassed before it rots; the limits on acquisition thus disappear. In this way, Locke argues that a full economic system could, in principle, exist within the state of nature. Property could therefore predate the existence of government, and thus society can be dedicated to the protection of property. Locke did not demand a republic. Rather, Locke felt that a legitimate contract could easily exist between citizens and a monarchy, an oligarchy or some mixed form ("2nd Tr.", sec. 132). Locke uses the term Common-wealth to mean "not a democracy, or any form of government, but any independent community" (sec. 133) and "whatever form the Common-wealth is under, the Ruling Power ought to govern by declared and received laws, and not by extemporary dictates and undetermined resolutions." (sec 137)  Locke does, however, make a distinction between an executive (e.g. a monarchy), a "Power always in being" (sec 144) that must perpetually execute the law, and the legislative that is the "supreme power of the Common-wealth" (sec 134) and does not have to be always in being. (sec 153) Furthermore, governments are charged by the consent of the individual, "i.e. the consent of the majority, giving it either by themselves, or their representatives chosen by them." (sec 140)  His notions of people's rights and the role of civil government provided strong support for the intellectual movements of both revolutions. The concept of the right of revolution was also taken up by John Locke in "Two Treatises of Government" as part of his social contract theory. Locke declared that under natural law, all people have the right to life, liberty, and estate; under the social contract, the people could instigate a revolution against the government when it acted against the interests of citizens, to replace the government with one that served the interests of citizens.