By Dominic Elliott
The author is a Reuters Breakingviews columnist. The opinions expressed are his own.
Many emerging economies have been banking on weaker currencies to revitalise economic growth. Oil's 25 percent fall in dollar terms this year should also help. The problem however is the dollar's strength which is leading to a general tightening of monetary conditions worldwide, more so in countries where central banks are intervening to prevent their currencies from falling too much.