The economic agent is different from her natural counterpart, the
atom, since she behaves the way she wants and not only in the
way she must. This is not an irrelevant detail because it requires
the social scientist not to draw analytical tools from hard sciences
as they are, but it compels to suitably adapt techniques to social
phenomena, or finding newer and sounder ones. Gintis and Helbing
start on a journal in that direction.