It even says at the end, "I’m not here to make any grand pronouncements about globalisation… My only point is that, when it comes to “location-based pay”, maybe we should be careful what we wish for." I take that as a pretty explicit "hey, this is difficult and I don't have a good answer".
There simply isn't enough value to pay them more. Software is the opposite. Each worker produces a lot of value so companies can afford to pay them more.
A few decades ago western countries were worried that Japan would take over the electronics market because they could produce much cheaper there. In reality Japan went up the value chain and Japanese products are just as expensive as in any other western nation.
Why? If your answer is “Because a T-shirt isn’t valuable”, then that’s a circular argument.
A T-shirt manufacturing employee’s wage is capped as some fraction as the value of that shirt to an end consumer times the number of shirts they can make in a year.
If you were a peasant back then you might have owned two shirts: your regular one that you wore every day, and a 'fancy' one for church, weddings etc.. When your shirt got too ragged you cut it up and tailored it into clothes for your children, or used the material to patch up holes in other clothing. When even those got too decrepit you'd use them as kitchen rags etc. until they literally disintegrated. Cloth was too valuable to waste!
We truly do live in a world of abundant excess in the modern era, and we should appreciate it.
We do, as in you and I, sure. But isn't the point here that those making things like mass-market t-shirt for very low wages are not sharing in that world of excess. At least not in an equitable manner.
Why is it that these people should work for low wages so that you and I can enjoy cheap T-shirts, but I'm not expected to produce websites and computer programs for low wages so that people can enjoy cheap business tools?
This is in large part driven by most website development being semi or entirely custom. (People who use Shopify to make storefronts or Facebook to make company landing pages don’t make the same amount as Shopify or Facebook devs.)
And when you start looking at why that is you get pretty awkward answers like: because of selectively enforced free market ideals where capital is free to move across borders but labour isn't. Which are ultimately backed up by military power.
Companies do this because they are not hold liable for the environmental damage done locally and by the transport, not even mentioning the low safety standards etc.