It can mean these things:
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Whoppers go up in price by the percentage of increased labor cost that makes up the chain’s operating costs. On average, labor makes up about 30% of the cost of fast food, so if $1.00 of a $3 whopper is labor, increasing labor costs by 50% will raise the price of a Whopper from $3.00 to $3.50. A $10 food order becomes $11.50. This assumes that demand for fast food from the same place is perfectly elastic.
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Rising labor costs punish high-labor goods vs low-labor goods. The food places that require less labor grab market share from the ones who use more manual labor. So you not only get a race to automate, but people on the margins who would otherwise have gone out tomeat now staty home and cook. So the industry overall shrinks, and jobs are lost with it.
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Businesses respond to higher minimum wages by making the employees work harder, but getting rid of so-called ZMP (zero marginal productivity) employees who are now negative, and by keeping only the hardest working. The job market gets much harder for the very people you are trying to help, such as marginalized applicants with no work record.
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Business respond by eliminating their least profitable hours, going to skeleton staffs overnight, etc. Restaurants that were previously 24 hrs now close overnight, etc. Those jobs are lost.
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Businesses try to compensate for higher labor costs by cutting elsewhere. Portion sizes, food quality, etc. Tim Hortons lowered food quality, and it’s hurting them badly. Or, they cut employee benefits.
There is no scenario under which the workers just get paid more, and things go on as before. That’s a fantasy.