Could be a "chicken or the egg" causal conundrum to some degree - does investment follow profit, or does profit follow investment? Of course, overall desktop sales - both PC and Mac - have declined since the advent of smart phones, but a more telling statistic would be to compare Mac sales trends compared to PC sales trends, especially over the last 3 years or so. Top of the line PC hardware has shown significant improvement over that period. Mac development appears to have stagnated a bit of late, and especially laptops have had some QC issues with keyboards, displays, and overheating/throttling. Doing a google search, I could only find relevant statistics through 2016. Apple is finally coming out with a new Mac Pro, but it's beyond the financial reach of most Mac users. The old "cheese grater" Pros were never cheap, but weren't nearly so expensive as the new line, where even a display stand runs about a thousand bucks. Another interesting stat would be proportion of desktops vs. laptops with both PC's and Macs.