Strangely enough, Kalecki was one critic of GDP because it included government expenditures on final goods and services in the identity. He argued for another concept -- the Restricted Market Production Concept (RMPC).
It measured only activity that passed through the market—though not necessarily private activity, since some government services, such as alcohol sales in state-run stores, occur in competitive markets. The underlying justification was that only market transactions reveal value.
"Generally speaking, changes in the prices of finished goods are cost determined while changes in the prices of raw materials inclusive of primary foodstuffs are demand determined".
-Michał Kalecki