“…Furthermore, no research interacts CP, the initial level of development, and institutional quality to examine the mediating effects of the CP, institutional quality, and their interaction on convergence. Moreover, research that uses model specifications with the interaction term between interval/ratio variables rarely (except for [8,18]) recognises that the estimated marginal effect (the slope coefficient), as well as its significance, is conditional, i.e., it depends on the value of the mediating factor. It means there could be a range of values for the mediating factor over which the estimated marginal effect of the CP is positive and the range over which this effect is negative.…”