Here are entered works on trade among nations. Works on foreign trade of specific countries, cities, etc. are entered under headings of the type [place]--Commerce, further subdivided by place, if appropriate. If so subdivided, a second heading is assigned with the place names in reverse positions, e.g. 1. Canada--Commerce--United States. 2. United States--Commerce--Canada.
Here are entered works on the financial crisis triggered by the rapid rise of subprime mortgage defaults and foreclosures in the United States in 2008, resulting in the failure or near-failure of several large financial firms, worldwide recession, and dramatically declining stock market prices. Works on the economic effects of this crisis in specific places are entered under headings of the type Financial crises--[place]; Recessions--[place].
Here are entered works on education for international understanding, world citizenship, etc. Works on schools with student bodies consisting mainly of non-citizens, such as children of embassy officials, are entered under International schools.
Here are entered works on the transition between types of energy systems, such as the transition from systems based on fossil fuels to systems based on renewable and clean energy sources.