Commodity flow or domestic trade statistics is a compilation of data on commodities carried through air, rail, and water transport systems within a given country. However, in the Philippines, the Philippine Statistics Authority (PSA) compiles domestic trade carried through air and water only.
Data on the inflow and outflow of commodities in the different regions of the country are used to construct inter-regional and inter-industry relation tables. These serve as bases in the formulation and implementation of various regional development programs like countryside development and port planning.
The 1993 Philippine Standard Commodity Classification (PSCC), Revision 2 is used to classify the commodities at the 5-digit level (item) for coastwise statistics and 3-digit level (group) for air statistics.