That‘s a terrible idea. Just because China throws irresponsible amounts of cash at cars doesn‘t mean we have to do the same mistake. We can simply say it‘s not OK to sell products under manufacturing costs to gain market share and that‘s that. Let‘s not inflate the already oversized car market even more.
They can simply say they don’t subsidize their manufacturing and operate profitably at those prices.
Just saying something doesn’t make it work unless there are legal things that back up the position. And in foreign trade, that means tariffs… which economists have been screaming about (for decades) having negative ramifications that ripple through the economy.