In fairness, that&#x27;s a lot of information that Americans would consider private, going out through the mail in clearly marked envelopes.  They can only be so casual about it in Sweden because they also have the social practice of being less secretive about how much they make.<p>With that said, if we could nail down the authentication process, we could do here (and should).  It wouldn&#x27;t improve <i>everyone&#x27;s</i> situation -- e.g. if you have a lot of income from hard-to-track sources -- but for most people it would be a godsend.