Signs of a change in investor psychology flashed brighter, as stock indexes on Friday edged closer to all-highs of September 2018.

This past week's cover of Barron's, a financial magazine, said the 10-year old market could go on for years, and Friday's headlines were similarly ebullient.

The S&P 500's 50-day moving average crossed above its 200-day moving average, forming a "golden cross," which market technicians believe is a bullish indicator. Golden crosses have given pretty good market signals and occur infrequently.