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Tuesday 28 October 2008

Economists do not understand what drives productivity growth very well. However, we know these facts: productivity grew rapidly after the second world war and then sometime between the late 1960s and mid-1970s it slowed dramatically only to re-accelerate to record levels in the mid-1990s. Unfortunately, even before the downturn, underlying productivity growth appeared to be slowing. The most plausible explanation is that an array of transforming investments and technologies – the interstate highway system, widespread air travel and the expansion of electronics – were spurs to growth during the postwar period. Eventually their impact dissipated and, as energy costs rose, growth slowed until the information technology revolution kicked in during the 1990s. Unfortunately, the IT supply shock that powered the economy in the 1990s and early part of this decade appears to be diminishing. Lawrence Summers

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