The Soda industry is a perfect example of a Monopolistic Competition. This is because this is an industry that has differentiation in their products. Take Pepsi and Coke for instance they are similar but are distinguished as 2 different goods in the market. Also to go into the soda industry has very few barriers.
The ACS 1-year data shows the median family income for Springfield was $74,517 in 2015. Compared to the median Illinois family income, Springfield median family income is $633 higher. As with the median household income data, 2016 family income data for Springfield will be released in September of 2017.
If you are in a big city, you tend to make more, but the cost of living is outrageous so I personally think you go in the hole. Anyway, the last time I checked the average in the state of Illinois was $30,000. That is the average mind you and a first year teacher would not get paid that much. I taught for nine years, but I was then in the state of SC and that was seven years ago. I started in 1990 at $18,600. When I finished in 1999 I was making 24,000.