For example, in policies.csv we see that AdultEducationSubsidies has an effect on Education, but AdultEducationSubsidies is not listed as an input to Education in simulation.csv - what does this mean in terms of the calculations?
What difference is there between defining an input in Y from X, or just adding an output in X to Y?
GDP and CO2Emissions are another example - GDP has CO2Emissions under its effects, but CO2Emissions does not have GDP as an input?