There is nothing definitive, but I always take into account the following:
- Is it a niche genre?/not to western tastes. A good example of this was Katamari on the PS2.
- Who is publishing it and does it have a lot of advertising behind it? A small publisher sometimes can mean a small print run.
- Lastly look in shops. If there is no copies or a small amount on the shelf compared to other releases then chances are this is because there is less made.
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