Federal Reserve head Janet Yellen is keeping alive the tradition of her predecessors, Alan Greenspan and Ben Bernanke, by showing she is equally as blind-sighted to the bubbles central banks are blowing in the bond and equity markets.

During her September press conference, Yellen stubbornly clung to the misconception that it is only possible to tell if a bubble exists after it bursts. And because of this delusion, in Yellen's eyes, 96 months of a virtual Zero Interest Rate Policy (ZIRP) is merely, and I quote, "a modest degree of accommodation."

Her blinders are so opaque that she claims to see, "no signs of leverage building up." And her feckless ability to spot market imbalances even resulted in this doozy of a Yellen quote: "In general, I would not say that asset valuations are out of line with historical norms."

Can it really be the case that the woman who holds a dictatorship on the cost of money, which is the most important price signal in an economy, is unaware that the stock market is at a level that is virtually the most overvalued in history? The median price-to-earnings, price-to-sales and total-market-cap-to-GDP ratios all show that the equity bubble is about as far detached from economic reality than at any other time in history.

For example, the market cap of equities in relation to the size of the economy is over 70 percent points higher than the level experienced from 1975-1990.

Total market cap to GDP ratio