You may have heard that if a butterfly flaps its wings in Brazil it can precipitate a series of weather patterns that lead to a Typhoon in Malaysia. Another way of putting it is that 'small triggers can have complex consequences'.
So how can parliament, or anyone else, predict the detailed consequences of a policy?
It takes a super computer to have a chance of predicting the weather. And that is what we have for making political decisions when we link massive numbers of people together in an election: A supercomputer that processes discrete knowledge, experience, intellect, values and personal forecasts to come to an optimal solution (if not the perfect one).