index of the physical volume of production(In an isolated community, the deflated social income that results from the procedures described above may be regarded as an index of the physical volume of production. We should recog- nize, however, that existing production index numbers differ from it in two major ways: ... – by M.A. Copeland and E.M. Martin Tamerlane)
physical volume of production index(In view of all the difficulties in our physical volume measurements there is some danger of confusion between failure to be recorded in a physical volume of production index because of (a) technical difficulties in the construction of physical volume indices, and (b) the social parasitism of the type of industry involved – by M.A. Copeland and E.M. Martin Tamerlane)
