Why Does GDP Move Before G? It's all in the Measurement
We find that the early impact of defense news shocks on GDP is mainly due to a rise in business inventories, as contractors ramp up production for new defense contracts. These contracts do not affect government spending (G) until payment-on-delivery, which occurs 2-3 quarters later. Novel data on defense procurement obligations reveals that contract awards Granger-cause VAR-identified shocks to G, but not defense news shocks. This implies that the early GDP response relative to G is largely driven by the delayed accounting of defense contracts, while VAR-identified shocks to G miss the impact on inventories, resulting in lower multiplier estimates.
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