Five puzzles in the behavior of productivity, investment, and innovation

Gordon, Robert J.

"(1) Whatever happened to the cyclical effect? Skeptics were justified on the basis of data through the end of 1999 in their claim that part of the post-1995 productivity growth revival reflected the normal cyclical correlation between productivity and output growth. In contrast data through mid-2003 reveal only a negligible cyclical effect for 1995-99 but rather a temporary bubble in 2002-03. (2) Why did productivity growth accelerate after 2000 when the ICT investment boom was collapsing? The most persuasive argument points to unusually savage corporate cost-cutting and hidden intangible investments in the late 1990s that provided productivity benefits after 2000. (3) The steady decline in the price of computer power implies steady technical progress, but then why did computers produce so little productivity growth before 1995 and so much afterwards? We draw an analogy to...