Table 3 σ-Convergence results...

Table 3

σ-Convergence results (dispersion of tariffs, 1990–2020)

Model	Variable	Coefficient	Std. error	t-statistic	R²
(1) Linear	Year	−0.0847	0.0050	−16.78	0.648
(2) Quadratic	Year	−10.1148	2.4072	−4.20	0.684
	Year²	0.00250	0.00060	4.17

Note(s): Interpretation: The negative linear term supports global tariff dispersion reduction (σ-convergence)

The positive quadratic term suggests that convergence has decelerated after 2000s. *** denote significance at the 1% level

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