International interdependence: Some long-term trends and recent changes

This paper provides data on long-term changes in international interdependence. Transactions exchanged between societies and states are one possible means of interdependence. Two decades ago Karl Deutsch collected a substantial amount of data which illustrated a long-term decline in transactions since the beginning of the twentieth century. An extension of his time series data points to a possibly important reversal of that trend in recent years. This conclusion is in agreement with other empirical measures of international interdependence.