The cost side
http://wallen.typepad.com/wallen/2009/01/the-cost-drivers-impact-on-socalled-freemium-models.html
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... but marginal cost needs to be taken into account by wallenMar 1, 2009
http://wallen.typepad.com/wallen/2009/01/the-cost-drivers-impact-on-socalled-freemium-models.html
... but marginal cost needs to be taken into account by wallenMar 1, 2009
