| Variable | Description | Critical Questions Associated with This Variable |
| static Stock tStock | Static tStock variable used throughout the Transaction class | Q.1 |
| Double totalCost | Double totalCost variable used for total cost of stocks | Q.1 |
| Double acctValue | Double acctValue variable used for account value of transactions | Q.1 |
| Int rowCount = 0 | Int rowCount variable set to 0 | Q.1 |
| boolean flag = false; | boolean flag variable set to false | Q.1 |
| protected double cost = 0; | protected double variable named cost set to 0 | Q.1 |
| static boolean bought = false; | static boolean variable named bought set to false | Q.1, Q.5 |
| static boolean held = false; | static boolean variable named held set to false | Q.1, Q.5 |
| int maxNumshares; | integer variable named maxNumshares for the maximum number of share for each stock | Q.1 |