$AMRS $ENPH $SPWR $BE Good advice from Motley Fool on today's tumble: Market participants attributed the downward move to a number of factors. Treasury Secretary Janet Yellen stated her belief that interest rates might need to move higher from current levels in order to keep inflation in check during an anticipated economic recovery. Lately, that's been the kiss of death for growth-oriented stocks, especially smaller companies that aren't yet profitable and are counting on making money far into the future. In addition, although earnings performance has been generally strong, stock prices haven't reacted with as much enthusiasm. In many cases, companies have reported solid business performance but have seen their share prices fall. That reflects expectations that pent-up demand will help companies whose businesses suffered short-term hits during the worst of the COVID-19 pandemic.