In theory, there are couple benefits:

* Cheaper products for everyone

* Competition drives innovation

* Lower risk of large-scale wars

* Ship high-pollution industries overseas

* Improved price stability

In practice, it falls apart because...

- US has a poor social safety net. Low-income workers often end up jobless or in even lower skilled jobs

- Globalism builds bigger corporations, which actively suppress competition

- Big direct wars are replaced with constantly simmering proxy wars

- We can't control environmental degradation in other countries

People who can buy cheaper fridges. People who can sell cheaper fridges.

How can people buy cheaper fridges when they're no longer employed because it is cheaper to employ someone to do their jobs where safety, benefits and human rights don't exist?

Unemployment doesn't work that way. Otherwise, eg Singapore would have lots and lots of unemployment.

Enough aggregate demand and a flexible labour market lead to low unemployment. (And on the flip side, a shortfall of aggregate demand can lead to recession and high unemployment.)

Central banks can with their fiat currencies these days can always print enough money (eg quantitative easing) to prop up aggregate demand, if they choose so.