A prominent economist, Ed Yardeni, has posited that a significant market downturn, comparable to the 2008 Lehman Brothers collapse, would be necessary to align with the current pessimistic sentiment in the markets. This assessment reflects the prevailing gloom in the financial sector, where market participants are exhibiting caution and concern about the overall economic outlook. Yardeni's view is based on the disparity between the current market conditions and the level of pessimism among investors, which he believes requires a substantial market correction to reconcile.