> a) no country has ever tried it, really, so there isn't a real-world experience case to look at yet.

Argentina had implemented a minimum income based on the number of children of a family. There are some studies about it like: http://www.degruyter.com/dg/viewarticle/j$002fbis.2012.7.iss...

This is not a basic salary but it's an important income for poor families.