First, strong opinions are not knowledge. In the event that one economist forgets that, the other nine will remind him of it. But that's hardly the case right now. There's a lot of discussion on what should be done right now on the part of economists, but it's very clear that nobody is quite sure of what to do. Which is why there is so much discussion in the first place.
Second, knowledge about the economy, specially such that all could become "billionaires", is empirical knowledge and knowledge of particulars such as knowledge of when to time thr markrt. Economists have some conjectural and general knowledge regarding some policies which leads the profession to develop something akin to a consensus on certain issues (10 out of 10 is really a gross exaggeration), such as rent controls. But there has never been a proposition in economics which hasn't found defenders against any supposed consensus, specially nowadays, with the incentives to publish surprising results, and most are conscious of it. The issue with the comparison with any sort of divination is that economists do not claim to be good forecasters.
