Those rejoicing in this year's stock rally should prepare for the end of the good times and the meager gains of the S&P 500 over the next 10 to 15 years, Business Insider reports a warning from one of Wall Street's top asset managers and founder of Smead Capital Management, Bill Smead.

The stock market has seen strong growth this year and is up 8%. However, Smead does not consider this a reason for optimism, as the speculative bubble that has formed is in full swing and can lead the market to a "dead era" that will last at least ten years. Its losses will be comparable to those of the dot-com bubble and the global financial crisis.

During the next decade, two full-fledged bear markets are likely to form, where it will become impossible to profit from the S&P 500, the expert predicts. This can be facilitated by the steady inflation in the U.S., which has been above expectations for the past three months.