This is source I found from another site, main source you can find in last paragraph
The U.S. economy is poised to deliver a third straight quarter of at least 3 percent growth, the longest such streak since 2005 and a pace that could be sustained into next year if Congress passes a tax overhaul, White House chief economist Kevin Hassett said.
Hassett, in an interview with Bloomberg News in Washington Thursday, said a rise in capital spending, given even more momentum by the Republican tax-cutting plan which would allow for immediate expensing of investment, could provide the positive growth shock the economy needs to break out of the ho-hum expansion of the past eight years.
Economists such as Harvard University’s Lawrence Summers have argued that the pattern of low interest rates, slow growth and low inflation are tied to persistent structural problems, a malaise he calls “secular stagnation,” borrowing a term from the American economist Alvin Hansen from the 1930s.
“The whole secular stagnation hypothesis is looking a lot more tenuous just because of what happened since President Trump” won the election, Hassett said. “What is it that changed most this year? It’s that capital spending is really starting to move in the right direction.”
When significant tax legislation is approved, “it’s hard to come back to a story where you come back to 1.8 percent or whatever the CBO says is potential GDP growth,” he said, referring to the Congressional Budget Office. The CBO >forecasts the U.S. growth potential at just less than 2 percent through at least 2027.
Hassett said he prefers the Federal Reserve Bank of Atlanta’s model, called GDPNow, for tracking gross domestic product. It currently estimates fourth-quarter growth at a 3.2 percent annualized pace.
“If you asked me what the best guess is for Q4, my back-of-the-envelope is just to say GDPNow,” said Hassett, the chairman of President Donald Trump’s Council of Economic Advisers. “That is as good of a guess as there is. That would give you 3 percent going into next year for three quarters in a row.”