Quite apart from IMF pressure, Third World governments are aware of the export successes of the East Asian Tiger' economies (Hong Kong, Singapore, South Korea and Taiwan and of the collapse of the Soviet economic model. They were afraid of being excluded from the world trading system by the development of trading blocks such as the European Union, finalized by the Maastricht Treaty, and the North American Free Trade Agreement (NAFTA), both signed in the early 1990s. So they tended to liberalize their economies, lowering trade barriers and opening up to international trade