Before revision:  We uncover variations of country- and transaction-based nestedness over time, and identify the countries and industries that most contributed to nestedness by assessing the effects of the removal of nodes and layers on the participation matrices .
After revision:  Drawing on appropriate null models that preserve the countries' or layers' degree distributions in the original multi-layer network, we uncover variations of country- and transaction-based nestedness over time, and identify the countries and industries that most contributed to nestedness by assessing the effects of the removal of nodes and layers on the participation matrices .