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320 Sp<strong>in</strong>n<strong>in</strong>g <strong>and</strong> weav<strong>in</strong>g of cotton & wool 0.0340134 0.049388 0.031043<br />

323 Leather <strong>and</strong> leather products 0.0953683 0.050376 0.0288<br />

These results are further corroborated by the decl<strong>in</strong><strong>in</strong>g mean values of the geographic<br />

concentration levels. Table 4.14 reports the mean values of <strong><strong>in</strong>dustrial</strong> concentration<br />

across 3-digit <strong>in</strong>dustries <strong>in</strong> Punjab. The mean value of EG <strong>in</strong>dex rema<strong>in</strong>ed roughly<br />

constant from 1995-96 to 2000-01, but the <strong>in</strong>dex drastically fell by about 33% <strong>in</strong> the<br />

next five years. The decl<strong>in</strong>e <strong>in</strong> <strong><strong>in</strong>dustrial</strong> concentration is ma<strong>in</strong>ly expla<strong>in</strong>ed by the<br />

decl<strong>in</strong>e <strong>in</strong> raw concentration measure (G<strong>in</strong>i <strong>in</strong>dex), <strong>and</strong> the change <strong>in</strong> average plant size<br />

measured by the Herf<strong>in</strong>dahl <strong>in</strong>dex is less important <strong>in</strong> expla<strong>in</strong><strong>in</strong>g<br />

Table 4‐14: Mean values of <strong><strong>in</strong>dustrial</strong> concentration measures overtime<br />

Concentration measure<br />

Concentration <strong>in</strong> Punjab<br />

1995-96 2000-01 2005-06<br />

Ellison-Glaeser <strong>in</strong>dex 0.1833 0.1789 0.1189<br />

G<strong>in</strong>i <strong>in</strong>dex 0.2794 0.2656 0.2186<br />

Herf<strong>in</strong>dahl <strong>in</strong>dex 0.1465 0.1406 0.1374<br />

Survey Year<br />

2000-01 0.8626<br />

Correlation of EG <strong>in</strong>dex<br />

2005-06 0.7820 0.7873<br />

the decl<strong>in</strong>e <strong>in</strong> <strong><strong>in</strong>dustrial</strong> concentration. The correlation coefficient of the EG <strong>in</strong>dex<br />

further corroborates these results, which <strong>in</strong>dicates a decl<strong>in</strong><strong>in</strong>g trend <strong>in</strong> the dynamic<br />

<strong><strong>in</strong>dustrial</strong> concentration levels <strong>in</strong> Punjab across <strong>in</strong>dustries. It reveals that the correlation<br />

coefficient of EG <strong>in</strong>dex between 1995-96 <strong>and</strong> 2000-01 was 0.86, which fell to 0.79<br />

between 2000-01 <strong>and</strong> 2005-06. It suggests that the agglomeration of <strong>in</strong>dustries<br />

followed a decl<strong>in</strong><strong>in</strong>g trend overtime.<br />

4.3.6 Localization versus Urbanization Externalities<br />

Localization <strong>and</strong> urbanization externalities are related to local scale externalities that<br />

arise from local <strong>in</strong>formation spillovers l<strong>in</strong>ked with <strong>in</strong>put <strong>and</strong> output markets <strong>and</strong> local<br />

technological <strong>development</strong>s. If firms <strong>in</strong> a district learn from local firms <strong>in</strong> their own<br />

<strong>in</strong>dustry, this is called localization externalities; if firms learn from all firms <strong>in</strong> the<br />

337

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