I was refering to traditional liberal economical interpretation that because people on top of social-economical scale have MORE money, they can afford to pay MORE taxes.
Well you see, that may be called a liberal by nowadays right wingers, to taint the name of a liberal, but that doesn't make it a liberal. Liberal has a literal meaning and I appreciate it if you stick with it. But of course members of DNC in the US are more of a social democrat than pure liberals, or if any liberal gets on their raft is to protect his civil rights. Call them democrats, but not liberals. Thank you!