RT Journal Article SR Electronic T1 Free Versus Fixed Exchange Rates JF The Journal of Portfolio Management FD Institutional Investor Journals SP 68 OP 74 DO 10.3905/jpm.1977.408599 VO 3 IS 3 A1 Milton Friedman A1 Robert V. Roosa YR 1977 UL https://pm-research.com/content/3/3/68.abstract AB