1927 42 93 The present large incomes..are not from..a permanent money-flow from newly accumulated sources of wealth.
1953 C. F. Hockett in S. Saporta & J. R. Bastian (1961) 64/1 Money-flow (at least in one direction) is income.
1992 P. Jones & J. Cullis (BNC) 345 The tax of income that is not a money flow would be politically unpopular as it would have to be paid from the working partner's income.