What is the importance of balance of power in international relations?

Balance of power in international relations
is really important. By power, we mean not only the military power, but financial prowess and
political clout as well. An imbalance of military power causes one nation or a group of nations
to impose themselves on other countries. This could result in one-sided business and military
decisions, including adverse business practices, anti-dumping duties, military incursions, etc.
Then there is the issue of financial and political clout of certain countries, which causes
undue advantages to these countries. An example is the carbon dioxide emissions cut approved by
the United States (going back on their commitment of Kyoto Protocol). Unless a balance of power
is established, poor and militarily weaker countries will have no say in financial and military
affairs and will be forced to toe the line of powerful countries.