In the springs of 2010 and 2011, many observers who thought they detected evidence that the economy had decisively turned around were disappointed a few months later, Summers wrote.
"Several considerations suggest that this time may be different," he said.
Among them, he listed employment growth that has been running "well ahead" of population growth for some time, a higher U.S. stock market, and the fact that expected market volatility is "lower than at any time since 2007."
He also cited pent-up demand from consumers who have long put off purchases of new cars and other durable goods, and signs that the housing market is beginning to stabilize.
"For years now, the rate of new families setting up households has been well below normal as more and more young people have moved in with their parents," Summers wrote. "At some point they will set out on their own, creating a virtuous circle of a stronger housing markets, more 'family formation' that boosts demand, further improvement in housing conditions and so on."