The structure of the optimal order should be found by
scientific analysis. State of the art shifts over time. Marx's
scientific socialism was based on science a century ago; it must be
adapted accordingly. Laissez faire was based on too simple assumptions.
Collective goods and marginal welfare equality require State
intervention. Level of decision-making must be supranational in some
fields. Controversial points and the 'research needed to reduce
controversies are listed.