Bank balance and cash flow are different, as well, but obviously one has a strong influence on the other. Likewise, airplanes have both altimeters and vertical

Bank balance and cash flow are different, as well, but obviously one has a strong influence on the other. Likewise, airplanes have both altimeters and vertical speed indicators. Your VSI tells you what your altimeter will read in the future. Sales share is a leading indicator of market share/installed base. And obviously one year doesn’t make a trend, but if such a trend persists, then market share will eventually mirror sales, assuming consistent turnover/upgrade cycles. It’s definitely suggestive and worthy of notice. (Incidentally Apple is a just few percentage points away from market dominance and inviting regulation, which makes that percentage even more interesting.)