[0815test]

Did you miss the part where I was talking about effects on the margin, not just an arbitrary global change like 'they "just" stop doing it'? If the volume of that work were to drop by, say, 1% in value, product might drop by 0.1%. Or maybe, the unskilled workers' wages might rise to compensate, and then the skilled worker would no longer be so "scarce" compared to the unskilled worker. And you're very much underestimating the plausible effects of education or training. Maybe we don't need resto servers to get English degrees, but they might want to study some culinary-, food science- or hospitality-related track, and become more productive at the job they're already doing.