The explanation advanced for the drop in ASP (= users buying older cheaper devices) is dubious. Using the ASP here is assuming all the devices have been sold in

The explanation advanced for the drop in ASP (= users buying older cheaper devices) is dubious. Using the ASP here is assuming all the devices have been sold in USD. Over the last six months Euros and Yuans decreased in value. And Apple devices are also sold at a "constant" price in these currencies. This more likely to explain the drop.