Formatting financial statements in commn size can eliminate inherent bias' that usually occurs whenever analyzing companies of differing sizes. Common size also allows for the analysis of a company over various time periods rapidly, e.g. revealing what percentage of sales is cost of goods sold and how that value has changed over time.
Ameren Illinois Co, https://www.ameren.com/illinois/about-us, SIC Code: 4911, ELECTRIC SERVICES
View Financial Statements Report for Ameren Illinois Co