I think the stocks should be divided by each platform because that is how the video game industry works. If you look at NPD or VGcharts data, it is all by Title (Platform).
Additionally, the games are not the same across platforms. Only the Xbox 360 and PS3 ones are going to be similar. The Wii game is generally very different. The DS and PSP version equally so.
A popular stock play is also to trade relative positions...such as right now long Smackdown (PS2) and short Smackdown (Xbox 360). You can tell if a certain stock is over or under valued by how it is priced vs the other console versions.
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Additionally, the games are not the same across platforms. Only the Xbox 360 and PS3 ones are going to be similar. The Wii game is generally very different. The DS and PSP version equally so.
A popular stock play is also to trade relative positions...such as right now long Smackdown (PS2) and short Smackdown (Xbox 360). You can tell if a certain stock is over or under valued by how it is priced vs the other console versions.