Stocks just got a majorly bullish signal

US consumer sentiment has proved fickle in recent decades, gyrating unexpectedly and generally keeping investors on their toes.
But when it has stayed high for a prolonged period, it has historically unlocked massive gains for stocks.
That's exactly what is happening right now. In fact, we seem to be about halfway into one of those high-confidence periods, after University of Michigan Consumer Sentiment Index data last Friday kept the trend intact.
Sentiment has been this high for this long on j