S&P 500 and Nasdaq show signs reminiscent of the 2000 dot-com bubble.
Market analysts warn of a possible lost decade for investors.
Historical patterns suggest a challenging economic landscape ahead.
Briefing: S&P 500 and Nasdaq face a lost decade as 2000 dot-com bubble parallels turn real
Strategic angle: MarketWatch reports on the potential for a prolonged downturn in major stock indices.