The G-8 and G-20 summits in Toronto are expected top 1$ billion (890億円) in cost.
"The G-20 meeting is expensive, but it has already paid for itself because China announced a strenghening of its currency, which is good for the United States and for many other countries." former top White House aides David Gergen.
France, Germany, Italy, Japan, the United Kingdom, the United States, Canada and Russia make up the industrialized countries of the G8. The G-20 is made up of the 20 top economies in the world---19 countries and the European Union. (from CNN 6/27)