...and yet taxation does not reflect environmental at all. In some countries cow milk is even subsidized. Edit: cow milk is actually less healthy than alternatives and there is no reason to encourage it.
> In some countries cow milk is even subsidized Because poor people consume it. Dairy products are also a replacement for meat if you're poor enough.
the price they get paid for their milk does not depend on what the consumers would be willing to pay, but on the large milk production companies who buy all their milk and dictate what they are willing to pay, and without subsidies they would simply buy their milk elsewhere.