Yes, that's what I was looking for too. I think the following quote is meant to address that:

> To bootstrap the system, an initial set of Actors who share the same core values about the to-be-created reputation each gets allocated a bootstrap Reputation Score. This gives them the ability to receive Rating Tokens with which they can rate each other and newly entering Actors.

So basically it assumes there is an initial set of trusted Actors.

But even with this assumption there are potential issues (e.g. good Actors may be bribed).