Traditional welfare economics shows that there are certain of these combinations that will be preferred by all the voters, which permits us to elimin… - Kenneth Arrow

Invention is here interpreted broadly as the production of knowledge. From the viewpoint of welfare economics, the determination of optimal resource allocation for invention will depend on the technological characteristics of the invention process and the nature of the market for knowledge.

Social theories are also social facts. Whatever explanatory value the “Marxist” or “conservative” models may have, they surely cannot be regarded as established with any degree of firmness. Yet excessive confidence in one or the other may have serious consequences. If “conservatives” believe too strongly that any move to socialism undermines democracy, then they may indeed act in accordance with the “Marxist” model, and vice versa. (Robert Merton long ago alerted us to “self-confirming” and “self-denying” social theories; here we have a pair of rival theories which are “other-confirming.”)

The fundamental fact which causes the need for discussing public values at all is that all significant actions involve joint participation of many individuals. Even the apparently simplest act of individual decision involves the participation of a whole society.
It is important to note that this observation tells us all non-trivial actions are essentially the property of society as a whole, not of individuals. It is quite customary to think of each individual as being able to undertake actions on his own (e.g., decisions of consumption, produc- tion, and exchange, moving from place to place, forming and dissolving families). Formally, a social action is then taken to be the resultant of all individual actions. In other words, any social action is thought of as being factored into a sequence of individual actions.