On September 22, 1985, five finance ministers walked into the Plaza Hotel in New York City and agreed to do something that almost never happens in global finance: deliberately weaken the world's reserve currency.
The dollar had risen roughly 50 percent against major currencies since 1980. Paul Volcker's rate hikes to crush inflation had made dollar-denominated assets irresistible to foreign capital. That capital inflow drove the currency higher. By 1984, the U.S. trade deficit had reached $122 billion — politically untenable in an election year.
James Baker, Reagan's Treasury Secretary, assembled the finance ministers of France, West Germany, Japan, and the United Kingdom alongside Volcker. The agreement: all five central banks would coordinate foreign exchange intervention to push the dollar down.
Within two years, the dollar index fell from near 160 to near 85. A 40 percent drop. No shot fired. No market panic. One coordinated meeting.
What made it work, and what did it ultimately break?