<s>[INST] After the city council has decided to build a new road, there are two possible routes to consider: the "coastal route" and the "inland route". The coastal route would be $12 million cheaper than the inland route. On the other hand, the inland route would cause less environmental disruption and promote greater economic growth. After hearing from several experts, the city council has decided that the environmental and economic benefits of the inland route are worth $8 million. Therefore, the net cost of the inland route, relative to the coastal route, is $12 - 8 = $4 million. The city council concludes that, since the inland route is cheaper, it is the preferred choice.

I think there's a flaw in the reasoning. What is it?[/INST]