A Wall Street firm studied every crash over the past 100 years — and concluded that the unusual performance of 7 tech stocks is masking the risk of a prolonged meltdown

· The stock market's resurgence from its recent crash has largely been led by large technology stocks. 
· A Societe Generale study of severe bear markets over the last 100 years showed that cyclical stocks — not tech — has historically led during recovery periods like this. 
· This present anomaly raises questions...