It was actually Pigou who wrote this in 1920:
"Thus, if a man marries his housekeeper or his cook, the national
dividend is diminished" (Pigou, The Economics of Welfare, 1960,
pp.32-33), quoted in _Feminism and anti-feminism in early economic
thought_ by Michele Pujol, 1992, p. 169-170).
Fadhel Kaboub