International Economics

International economics is concerned with the effects upon economic activity from international differences in productive resources and consumer preferences and the international institutions that affect them. It seeks to explain the patterns and consequences of transactions and interactions between the inhabitants of different countries, including trade, investment and migration as follows: 

1. International trade studies goods-and-services flows across international boundaries from supply-and-demand factors, economic integration, international factor movements, and policy variables such as tariff rates and trade quotas.
2. International finance studies the flow of capital across international financial markets, and the effects of these movements on exchange rates.
3. International monetary economics and international macroeconomics study flows of money across countries and the resulting effects on their economies as a whole.
4. International political economy, a sub-category of international relations, studies issues and impacts from for example international conflicts, international negotiations, and international sanctions; national security and economic nationalism; and international agreements and observance.
5. International migration results in a net gain in economic welfare and wage differences, which indicated in the move of a skilled worker.
6. Globalization refers to complete mobility of capital and labor and their products, so that the world's economies are on the way to becoming totally integrated.

Source: https://en.wikipedia.org/wiki/International_economics