where five of its six states are strongly dominated by large urban centres (Holmes, 1973). Again, the results suggest that ratios at the provincial level are lower than the rank-size rule would predict. Linsky (1965) carried out a systematic comparison of primate city distributions on an international scale which suggested some links between high primacy and a generally low level of economic development, but the pattern was not a uniform or clear one (see also Section 4.3.3).