1/1/2005 · As David (1991) has pointed out, however, a GPT does not deliver productivity gains immediately upon arrival.Figure 1 shows the evolution of the growth in output per man-hour in the U.S. economy over the past 130 years, with periods of rapid diffusion of the two major GPTs shaded and the dashed line representing long-term trends as generated with the Hodrick–Prescott (HP) filter. 1

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Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

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