Paul Krugman answers both questions in his NT Times column.
... talking nonsense about economic crises is essentially a job requirement for anyone hoping to get the Republican presidential nomination.
To understand why, you need to go back to the politics of 2009, when the new Obama administration was trying to cope with the most terrifying crisis since the 1930s. The outgoing Bush administration had already engineered a bank bailout, but the Obama team reinforced this effort with a temporary program of deficit spending, while the Federal Reserve sought to bolster the economy by buying lots of assets.
... Republicans, across the board, predicted disaster. Deficit spending, they insisted, would cause soaring interest rates and bankruptcy; the Fed’s efforts would "debase the dollar" and produce runaway inflation.
None of it happened. Interest rates stayed very low, as did inflation. But the G.O.P. never acknowledged, after six full years of being wrong about everything, that the bad things it predicted failed to take place, or showed any willingness to rethink the doctrines that led to those bad predictions. Instead, the party’s leading figures kept talking, year after year, as if the disasters they had predicted were actually happening.
Now we’ve had a reminder that something like that last crisis could happen again — which means that we might need a repeat of the policies that helped limit the damage last time. But no Republican dares suggest such a thing.
Instead, even the supposedly sensible candidates call for destructive policies. Thus John Kasich is being portrayed as a different kind of Republican because as governor he approved Medicaid expansion in Ohio, but his signature initiative is a call for a balanced-budget amendment, which would cripple policy in a crisis.
The point is that one side of the political aisle has been utterly determined to learn nothing from the economic experiences of recent years. If one of these candidates ends up in the hot seat the next time crisis strikes, we should be very, very afraid.