I have a suggestion for the postgame report.  I suggest a revenue/cash chart by time with all the players on it.  That is, the Y-axis has revenue or cash, and the X-axis has time.  The cash variable is self-explanatory.  Revenue can be defined as anything that increases the cash value or decreases the debt value.  I believe it's the sum of Goods Sold, Goods Auto-sold, and Sold Offworld.

This is a rudimentary way to compare performance among companies in the business world, and it would be more informative in this game than comparing stock prices.   There might be other charts that are more useful (such as earnings/yield over time), but I wouldn't know without tinkering.