The question really is if such entrepreneur made such a shoe factory that still employed union labor at fairly high rates of pay, why wouldn't they just install

The question really is if such entrepreneur made such a shoe factory that still employed union labor at fairly high rates of pay, why wouldn't they just install that factory in a place where labor costs less? If the goal is union jobs at fairly high rates of pay, we can make high-productivity jobs like CVS employee (~$1.2mm revenue per employee IIRC) into good high-paying union jobs by incentivizing CVS employees to unionize. Even the type of high-value manufacturing present in the US tends to be less productive with labor than Costco (~$30k net profit per employee) or Delta (~$56k net per employee) or ADP (~$84k net). Since our labor pool is decreasing, it is even more critical for Americans to work in high-productivity jobs rather than moving the other direction.