Moneybox explains why Casey Mulligan is wrong about the current recession being due to a supply shock:
Casey Mulligan thinks the recession wasn't caused by a demand shock but is instead a
"redistribution recession"
caused by the fact that shifts in labor market incentives have made it
less worthwhile to work. John Quiggin says we can no this is wrong by
looking at the international data,
since there's a curious coincidence in timing of the fall in employment
in the United States, Iceland, Estonia, United Kingdom, Japan, etc.
that seems hard to explain by Barack Obama's Medicaid policies.
But I think there's an easier way to tell that it's wrong, and that's by looking at the inflation data above.
Imagine we passed a law putting the top federal income tax rate up to
75 percent and lowering the threshold for the top bracket to $100,000
for a single person and $200,000 for a married couple and used the
revenue to finance a progam that pays you a cash grant of $10,000 a year
if you don't have a job but gives you nothing if you're employed. It's
pretty obvious that a policy along these lines really would cause some
affluent people to downshift their careers and would cause some low wage
workers to just quit and live off a combination of the 10 grand and
under the table earnings. But in response you'd also see inflation.
With some affluent professionals working shorter hours or quitting
their jobs to launch the cupcake factories of their dreams, the price of
hiring the services of the remaining affluent professionals would be
bid up. Similarly, many minimum wage employers would have to raise
nominal wages to compete with the increased appeal of not working.
In other words you'd see exactly what you'd see from any other kind
of supply shock—a reduction in real output (fewer willing workers)
combined with an acceleration in the price level (scarcity) rather than
what we actually saw (see above) which is a collapse in the price level
at the exact same time as the collapse in output.
Something to recall is that although "supply-side economics" came to
just be code for "let's cut taxes" there's an actual reason that phrase
came into currency in the late-1970s namely that we were precisely
facing a combination of high unemployment and high inflation. That high
inflation was an excellent indicator that boosting demand would not be
effective in boosting output. So even if you think the specific proposed
supply-side remedy was cranky, it was smart to seize the "supply side"
label.
But that's not the situation we've been facing.
Krugman expounds on this theme:
Mulligan’s ...claim that increased use of the
social safety net is a cause rather than a result of the depressed
economy [is wrong]. As one of his commenters points out, this amounts to the claim
that soup kitchens caused the Great Depression. Quiggin [link] does an
admirable job of refuting this claim. I would, however, add one more
point. If you really believe that the problem is that excessive
generosity to the downtrodden is reducing the incentive to work, so that
what we really have is a supply problem rather than a demand problem,
you should expect to see upward pressure on wages.
What we actually see:
The textbook AS-AD model and labor supply models support the analysis that we are not in a supply shock. In real terms, wages are declining.
Note that the austerians and their fellow travellers (like Cochrine) have completely
forgotten their ideology when it comes to analysis of the “fiscal cliff”. This is a only problem under a purely Keynesian analysis. The cliff is the idea that the government
will suddenly almost balance its budget!
Everyone is scared that this dramatic Keynesian shock will plunge the
nation into recession, but if austerians were consistent, they would be proclaiming it is exactly what is needed to restore confidence.