High labor costs .... and low retail prices
Labor costs are one factor influencing production costs. High labor costs are often cited as one major reason for moving production abroad: It has become too expensive to manufacture domestically. This does of course not apply to all products, luxury products being a notable exception. Then again, many of those stop being luxury products affordable for a few, once they're mass produced in a low wage country. At the same time, they become less aspirational, but that's a different story.
But what exactly does 'too expensive' mean? It's not just about 'efficiencies' and 'economies of scale'. Simply put, it's about achievable retail prices not being high enough to cover production costs (including labor costs) plus a reasonable profit.
Consumers want everyday products at the lowest possible price and are often not willing to pay extra for domestic production. Those consumers are of course identical to the workers asking for the highest possible wage.
Obvious, some of you will say. You're right, but it's also inconsistent and worth considering next time you go bargain shopping.
