Used iPhones

Some short clips from Apple: https://www.youtube.com/watch?v=9m_K2Yg7wGQ

https://appleinsider.com/articles/18/07/09/researchers-claim-iphone-and-ipad-ownership-is-a-wealth-indicator

https://9to5mac.com/2019/02/08/four-year-smartphone-upgrades/

https://www.cnbc.com/2018/08/02/apple-hits-1-trillion-in-market-value.html

https://www.vox.com/the-goods/2019/1/3/18167072/apple-iphone-sales-down-china-upgrades-q1-2018

https://appleinsider.com/articles/19/01/29/notes-of-interest-from-apples-q4-2018-earnings-report-and-conference-call

https://www.kbb.com/new-cars/best-resale-value-awards/best-resale-top-10-cars/

https://www.motor1.com/features/233066/cars-worst-resale-values/2945502/

https://www.motor1.com/features/232042/vehicles-best-resale-values/2896407/

https://9to5mac.com/2018/07/23/iphone-x-resale-value/

http://fortune.com/2017/04/07/used-smartphone-highest-resale-value/

https://www.inverse.com/article/48731-iphone-xs-data-shows-how-past-apple-phones-hold-high-resale-value

https://www.musicmagpie.co.uk/phone-depreciation/

https://www.cultofmac.com/564655/used-iphone-value-high-little-depreciation/

https://www.cnet.com/how-to/iphone-trade-in-best-ways-to-sell/

https://priceonomics.com/phones/

https://www.forbes.com/sites/greatspeculations/2018/09/13/iphone-xr-will-cannibalize-sales-of-premium-iphones-but-that-shouldnt-worry-apple/#184db02e5b2d

http://fortune.com/2018/07/23/apple-iphone-x-value/

https://9to5mac.com/2018/09/06/iphone-x-trade-in-value/

https://www.bankmycell.com/blog/phone-depreciation/

https://www.economist.com/finance-and-economics/2017/05/06/price-bots-can-collude-against-consumers

http://www.michaeleisen.org/blog/?p=358

http://money.com/money/3136612/dynamic-pricing-amazon-best-buy-walmart/

https://www.theverge.com/tldr/2017/7/10/15946296/amazon-bot-smartphone-cases

https://qz.com/1486722/no-one-wants-a-cheap-iphone/

https://www.nytimes.com/2019/01/05/technology/apple-iphone-replacement-mom.html

https://appleinsider.com/articles/18/02/28/user-satisfaction-refurbished-device-prevalence-may-hurt-future-iphone-sales

https://fee.org/articles/apples-environmental-claims-are-misleading/