The dollar is insanely strong right now and global Mac prices raised in accordance with that. In places that don’t use USD, prices shot up by tens of percent overnight while the US prices are the same as ever. Japan, for example, got a price increase of about 40% on all items. Unsurprisingly, sales declined.
Not to mention, in the past year the price of almost everything else has gone up too. So, it's easy to see why people have less money to spend on macs.