Before revision: By analysing the financial data of firms across Japan, a non-trivial power law with exponent 1.3 is observed between the number of business partners (i.e. the degree of the inter-firm trading network) and sales.
After revision: By analysing the financial data of firms across Japan, a nonlinear power law with exponent 1.3 is observed between the number of business partners (i.e. the degree of the inter-firm trading network) and sales.