In $2000$ the BC government estimated that $1$ million Salmon were missing from the Fraser River. This created a debate over what has happened to the fish. Some people argued that the fish were poached $($caught illegally$)$ and then sold, while others argued exceptionally warm ocean water killed the fish before they could reach the river. Knowing that $1,000,000$ fish is a significant number in terms of the total quantity caught and sold, how could you look at the BC fish market and tell if the $1,000,000$ missing fish were caught illegally or killed by nature? $($Hint: draw a demand and supply graph and think which curve would shift in each of those cases that people are arguing about.$)$