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PS4 has unlimited demand. Its limited supply ensures its sales week are erratic. Around 300k one week and then it goes back down to 150k another week. PS4 should be able to sell 300k per week on a continuous basis and with Xmas sales help it sell over 20 million in a year. PS4s limited supply is slowing down its sales. PS4 should easily sell over 20 million for the next 3 or 4 years. That is an indisputable fact. PS4 should reach 100 million sales in 4 years time.