For instance, in the allocation of means to ends in economics there are usually competeing “non-specific” means towards a given end.
But in political and ethical philosophy, there is IMO, a tendency to exactly one solution for every problem.
For instance, how does one create the perfect state? Every philosopher differs in his rule but all agree that there is only one proper way of constituting the perfect state. For marx, it was one specific arrangement of classes and for machiavelli/livy it was one specific set of habits and character traits. In no case would these philosophers say that some other set of traits would yield an equal outcome.
So I think that is one reason why people don’t really understand economics, namely because everyone implicitly disbelieves that an economic problem even exists.
Another interesting outcome of this conclusion IMO, is that economic calculation is totally practicable according to pol. sci./ethics since only a few and completely specific means are needed to produce just one end and, given these means are attained, there can be no deviation from the perfect constitution; every perfect society is by definition a steady equilibrium.
Any other thoughts would be interesting.