Green set up an office in the Chemical Bank, but continued to live in boarding houses, flats, or hotels. By then she was known as the "Queen of Wall Street." Her investing philosophy, in her words, included, "In business generally, don't close a bargain until you have reflected on it overnight." She also thought, "It is the duty of every woman, I believe, to learn to take care of her own business affairs," and "A girl should be brought up as to be able to make her own living..." "Whether rich or poor, a young woman should know how a bank account works, understand the composition of mortgages and bonds, and know the value of interest and how it accumulates."