In Marcelo Dascal (ed.), Leibniz: What Kind of Rationalist? Springer. pp. 357-370 (2008)

Markku Roinila
University of Helsinki
Leibniz frequently argued that reasons are to be weighed against each other as in a pair of scales, as Professor Marcelo Dascal has shown in his article "The Balance of Reason." In this kind of weighing it is not necessary to reach demonstrative certainty – one need only judge whether the reasons weigh more on behalf of one or the other option However, a different kind of account about rational decision-making can be found in some of Leibniz's writings. In his article "Was Leibniz's Deity an Akrates?" Professor Jaakko Hintikka has argued that Leibniz developed a new vectorial model for rational decisions which is better suited to complicated decisions, where values are complementary to each other. This model, related closely to his work in metaphysics and the philosophy of mind, is a heuristic device which helps in finding rational combinations - and in an ideal case an optimum - between plural inclinations to the good. I shall argue that Leibniz applies more or less implicitly both of these models in his practical rationality. In simple situations he applied the pair of scales model and in more complicated situations he applied the vectorial model.
Keywords Leibniz  Deliberation  Decision models  Moral psychology  Rational Decision-Making  Practical rationality
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Logic: The Theory of Inquiry.John Dewey - 1938 - New York, NY, USA: Henry Holt.
Elements of Intuitionism.Michael Dummett - 1977 - Oxford University Press.
Causes and Conditions.J. L. Mackie - 1965 - American Philosophical Quarterly 2 (4):245 - 264.

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