ECON 202 Lecture 2: Chapter 2.1

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An empirical relationship known as the gravity model helps to make sense of the value of trade
between any pair of countries and also sheds light on the impediments that continue to limit
international trade even in today's global economy
Recent decades have been marked by a large increase in the share of world output that is sold
internationally, by a shift in the world's economic center of gravity toward Asia, and by major
changes in the types of goods that make up that trade
U.S has 15 major trading partners with Canada being first then China second.
These countries accounted for 69% of the value of U.S that year
Who Trades with Whom?
They have the highest values of gross domestic product (GDP), which measures the total
value of all goods and services produced in an economy.
Strong empirical relationship between the size of a country's economy and the volume of
both its imports and its exports
U.S trades with Germany, UK, and France because these are the three largest European economics
Size Matters: The Gravity Model
Looking at world trade as a whole, economists have found an equation of the following form
predicts the volume of trade between any two countries
A is constant
Tij is the value of trade between country I and country J
Yi is country I's GDP
Yj is country J's GDP
Dij is the distance between the two countries
This equation is known as a gravity model of world trade
The trade between any two countries is, other things equal, proportional to the product of
their GDPs and diminishes with distance.
Economists often estimate a somewhat more general gravity model
Chapter 2
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World Trade: An Overview
January 3, 2018 5:35 PM
ECON 231 Page 1
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Document Summary

U. s has 15 major trading partners with canada being first then china second. These countries accounted for 69% of the value of u. s that year. U. s trades with germany, uk, and france because these are the three largest european economics. They have the highest values of gross domestic product (gdp), which measures the total value of all goods and services produced in an economy. Strong empirical relationship between the size of a country"s economy and the volume of both its imports and its exports. Looking at world trade as a whole, economists have found an equation of the following form predicts the volume of trade between any two countries. Tij is the value of trade between country i and country j. Dij is the distance between the two countries. This equation is known as a gravity model of world trade.

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