Donald Trump’s best issue by far is the economy, yet nobody knows what he would do about it

Julian Zelizer : Donald Trump's best issue by far is the economy, yet nobody knows what he would do about it.

Nobody, including within the campaign itself, believes Trump even wants to implement anything resembling his stated agenda, Zelizer says.

He says it's possible that, as in his first term, he muddles through, advancing the familiar Republican mix of regressive tax cuts, deregulation, and little else.

Zelizer asks: What if Trump goes all in on something like the traditional conservative anti-government agenda?.

Julian Zelizer : Reagan and Bush inherited low deficits from their predecessor.

Zelizer says they followed the same formula because it is the path of least resistance for Republicans .

He says whoever takes office next year will face much higher interest rates than Trump enjoyed during his first term.

Zelizers: A second Trump term would respond, one way or another, to dramatically altered circumstances.

Julian Zelizer : Donald Trump's first term is remembered as 'populist' but failed to destroy Obamacare .

He says a second term could revive his desire to slash spending on the poor and slash entitlements.