Call me skeptical given that it comes from JP Morgan (I distrust any mainstream Wall St. analysts given their track record) but if this is true, that would be crazy. Tim Reid, at Reuters:

Feroli laid out his math. J.P. Morgan's analysts expect Apple to sell around 8 million iPhone 5s in the fourth quarter. They expect the sales price to be about $600. With about $200 in discounted import component costs, the government can factor in $400 per phone into its measure of gross domestic product for the fourth quarter. Feroli said the estimate of between a quarter to a half point of annualized GDP "seems fairly large, and for that reason should be treated skeptically." But, he added, "we think the recent evidence is consistent with this projection." Again, that's crazy - but cool if true.