Charles Biderman, founder of the research firm TrimTabs spots a warning sign in the drop of the commodity prices and mistrusts the paper money of the centrals banks.

In every market supply and demand are determining the price. Charles Biderman uses this simple logic as the foundation for his investment philosophy. The outspoken founder of the research firm TrimTabs is convinced that stock prices are a function of liquidity—the amount of shares available to buy and the amount of money available to buy them—rather than fundamental value. Therefore, he carefully tracks the announced actions of companies. In his view they are among the biggest players in the stock market and the driving force behind today's bull market. For now, Biderman thinks that this trend will push stock prices even higher. For the medium term though, he cautions that the financial markets are poised for a severe crash. He spots the first signs of a global recession in the drop of the commodity prices and warns of the moment when people don't trust the paper money of the central banks anymore.