At different times, the manias spread through the world’s financial and economic commentariat. We have had regular predictions that Japan was about to collapse, with a mix of hyperinflation, government insolvency, Bank of Japan negative capital and more. During the GFC, the mainstream economists were out in force predicting accelerating inflation (because of QE and rising fiscal deficits), rising bond yields and government insolvency issues (because of rising deficits and debt ratios) and more. And policy makers have often acted on these manias and reneged on taking responsible fiscal decisions – for example, they have terminated stimulus initiatives too early because the financial markets screamed blue murder (after they had been adequately bailed out that is). In the last week, we have had the ‘inverted yield curve’ mania spreading and predictions of impending recession. This has allowed all sorts of special interest groups (the anti-Brexit crowd, the anti-fiscal policy crowd, the gold bug crowd, anti-trade sanctions crowd) to jump up and down with various versions of ‘I told you so’. The problem is that the ‘inverted yield curve’ is not signalling a future recession but a total failure of the dominant mainstream macroeconomics. The policy world has shifted, slowly but surely, away from a dependence on monetary policy towards a new era of fiscal dominance. We are on the cusp of that shift and bond yields are reflecting, in part, the sentiment that is driving that shift.