Exercise 2: What Remains Genuinely Contested About the 2009 Stimulus — Possible Solution
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The disagreement isn't over whether the stimulus had SOME real effect
at all - the chapter notes that surveys of economists show broad
agreement it reduced unemployment, and even Krugman's own critique
doesn't dispute that the stimulus helped, only that it wasn't large
enough. The basic DIRECTION of the effect (expansionary policy
supporting economic recovery) is not the contested part.

What remains genuinely contested is the real MAGNITUDE of the
effect - specifically, the size of the "multiplier": how much
additional real economic activity each dollar of government spending
actually generated. The CBO's projections, Krugman's argument that the
package was too small relative to the real scale of the 2008-09
downturn, and the 2019 study's finding that a more frontloaded rollout
would have produced a greater impact are all different estimates and
critiques of that same underlying magnitude question, not disagreements
about whether fiscal stimulus works in principle at all.

This distinction matters because it shows real economic uncertainty
here is narrower and more specific than "we don't know if this worked"
- it's closer to "we broadly agree this had a positive effect, but
genuinely disagree, with real competing evidence and models, on
precisely how large that effect actually was, and whether a different
size or timing would have produced a meaningfully better outcome."

ANSWER: The genuine disagreement isn't over whether the stimulus had a
positive effect at all - most sources broadly agree it did - but over
its real MAGNITUDE: how large the actual multiplier effect was, and
whether a larger or more frontloaded stimulus would have produced
meaningfully better results, which remains a real, actively researched
question rather than settled fact.

WHY THIS WORKS AS AN ANSWER
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This correctly narrows the real disagreement to magnitude rather than
existence of effect, using each cited source's own specific claim to
show what they actually disagree about.