Not sure if the global economy has any effect on the decline of Mac sales that made consumer spending less though I am not a marketing expert . The feedback I got from one Apple Reseller is their sales are mostly iPads, iPhones. Most of their regular customers are hanging on to their current older Macs. Some think the new models speed and features are only incremental that they are not inclined to buy newer Macs. Though this is just one sector's feedback and may not generally reflect the whole market.