Just as a note ...
Suppose you had sales that were slightly lower than you would typically expect for this time of year at 35,000 units per week for the first 3 weeks of April and then Grand Theft Auto 4 causes a 1 week spike to 70,000 units ... This would mean that the montly total would still only be 175,000 units and Grand Theft Auto 4 caused a week-over-week doubling of system sales.







