Actually, the standard economist answer to everything is “it depends.”
For example, Henry Ford demonstrated under some circumstances raising pay can lower labor costs. But those circumstances were 9 hour days on an assembly line, and that sucks so bad that absenteeism was high and turnover was huge (requiring costs to train new employees and slowdown of production).
By making $5 a day possible (not everyone got that much) over $2.25/day, absenteeism an turnover dropped because no one wanted to risk losing their job when they wouldn’t be able to find anything even half as good.
So......IF the increase in wages is offset by a reduction in other costs (e.g. training costs of turnover) and/or increase in productivity, AND the wages are significantly higher than competitors, THEN increasing wages is a good idea.
Anyone who ever stepped foot in Whole Foods, or any grocery store, would know that for them, the pay raise would not reduce any other costs or result in higher productivity.
But the idiotic “living wage” supporters don’t recognize that if everyone increase wages, then you gain no benefits, only higher costs.
And in any case something has to compensate for the increased labor costs.