TABLE 2. Estimating Intangible Capital 
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                                         1960-1969        1990-2001   
                                   -----------------------------------
 U.S. Values 
    Corporate tax rate                     0.450            0.349
    Growth rate of real GDP                0.040            0.030
    Real interest rate                     0.051            0.041
    Tangible depreciation rate             0.042            0.067
    Average corporate investment           0.082            0.097
    Contributions to profits:
       Tangible assets                     0.093            0.063
       Intangible assets                   0.008            0.007
       Total                               0.101            0.070
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 Estimate of Intangible capital            0.714            0.650
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