High oil prices are again transforming oil-exporting countries. With oil trading at $90 a barrel, government coffers in these countries are overflowing with the oil windfall, and stock markets there are booming. However, one feature of these oil exporters has not changed: their propensity to peg...

Roughly once a year, the managing director of the International Monetary Fund, the US treasury secretary and in some cases the finance ministers of other G-7 countries will get a call from the finance minister of a large emerging market economy. The emerging market finance minister will indicate...