Linked in Probabilities in the Game of Monopoly® by Truman Collins, are C source code files written to calculate the probabilities of normal Monopoly. We can just roll up our sleeves and tweak the program ourselves to see what kind of changes we get.
Choices
There are two separate programs linked: one that calculates the probabilities based on simulated die rolls, and one that uses a Markov matrix to calculate the exact probabilities. Collins says the data on the webpage were generated using a "extended" version of the Markov code, and then goes on to describe how even that process may be improved. However, to start off I decided to use the simpler (but less accurate) roll-up-the-probabilities code to see how far it gets us. I told it to simulate 10 million rolls. The code also outputs probabilities for two strategies: paying $50 to get out of jail immediately, and staying in jail until you get doubles or escape naturally. Below are only the probabilities for the "short jail" strategy.
Changes
I decided to split the difference between the two versions listed in the question, and add three Community Chest and three Chance cards that go to the Stock Exchange square, and also add the one Chance card the can send the player to jail. I chose for that card to always send the player to jail, rather than try and add in the complexity of simulating if the player had stocks.
Results
W/SE Rank Normal Rank Difference RankChange
Go 2.919 7 3.105 3 94.01% -4
Mediterranean Avenue 2.13 34 2.137 36 99.67% 2
Community Chest 1.577 37 1.888 37 83.53% 0
Baltic Avenue 2.143 33 2.16 35 99.21% 2
Income Tax 2.273 26 2.322 28 97.89% 2
Reading Railroad 2.781 12 2.958 6 94.02% -6
Oriental Avenue 2.205 30 2.267 32 97.27% 2
Chance 0.668 40 0.857 40 77.95% 0
Vermont Avenue 2.233 29 2.322 28 96.17% -1
Connecticut Avenue 2.188 31 2.302 30 95.05% -1
Visiting Jail 2.159 32 2.272 31 95.03% -1
St. Charles Place 2.5 22 2.71 14 92.25% -8
Electric Company 2.442 23 2.596 20 94.07% -3
States Avenue 2.274 25 2.372 26 95.87% 1
Virginia Avenue 2.373 24 2.462 24 96.39% 0
Pennsylvania Railroad 2.77 13 2.92 8 94.86% -5
St. James Place 2.711 15 2.799 12 96.86% -3
Community Chest 2.129 35 2.596 20 82.01% -15
Tennessee Avenue 2.842 10 2.935 7 96.83% -3
New York Avenue 2.947 6 3.088 4 95.43% -2
Free Parking/Stock Exchange 5.1 1 2.875 9 177.39% 8
Kentucky Avenue 2.704 17 2.83 10 95.55% -7
Chance 0.815 38 1.048 38 77.77% 0
Indiana Avenue 2.702 18 2.745 13 98.43% -5
Illinois Avenue 3.109 3 3.176 2 97.89% -1
B & O Railroad 3.08 4 3.073 5 100.23% 1
Atlantic Avenue 2.877 9 2.702 15 106.48% 6
Ventnor Avenue 2.916 8 2.683 16 108.68% 8
Water Works 2.955 5 2.816 11 104.94% 6
Marvin Gardens 2.746 14 2.581 22 106.39% 8
Go To Jail 0 41 0 41 0 0
Pacific Avenue 2.8 11 2.679 17 104.52% 6
North Carolina Avenue 2.711 15 2.624 18 103.32% 3
Community Chest 2.024 36 2.366 27 85.55% -9
Pennsylvania Avenue 2.6 19 2.5 23 104% 4
Short Line 2.535 21 2.438 25 103.98% 4
Chance 0.721 39 0.861 39 83.74% 0
Park Place 2.264 27 2.182 34 103.76% 7
Luxury Tax 2.236 28 2.189 33 102.15% 5
Boardwalk 2.556 20 2.617 19 97.67% -1
In Jail 4.284 2 3.948 1 108.51% -1
The addition of six cards that take you to the Stock Exchange square almost double the odds of landing on it. Due to the effect of it warping you across the board, in general the properties before the SE square have a slight reduction in probability, and the squares after it experience a slight increase. The Chance and Community Chest squares have the most dramatically lowered chance due to the increased chance of drawing a card that moves you away (from about 81% to 85%).
For rankings, the Stock Exchange square becomes the first or second most landed on square, depending on if you decide to stay in jail or leave right away. Illinois Avenue and the B & O Railroad continue to stay around the top, and the squares following them (Atlantic, Ventnor, and the Water Works) have some of the most notable increases in rank. New York drops down to sixth, after the Water Works. Go drops down to seventh, since the cards that warp you to the Stock Exchange put you the furthest away from GO possible.
If playing with this Monopoly Add-on, I'd probably invest in the Yellow.
