Gino Gancia, Giacomo Ponzetto, Jaume Ventura, 26 July 2017

The number of countries in the world more than halved during the first wave of globalisation, but then rose significantly during the second. Border changes have been much more peaceful during this second wave, and this column asserts that these observations are consistent with a theory in which political structure adapts to expanding trade opportunities. Globalisation makes borders costly. In its early stages, borders are removed by increasing country size, while in later stages, the cost of borders is removed by creating peaceful economic unions, leading to a reduction in country size.