Over the last few decades, east asian economies have increased their share of world gdp. similarly, intra-east asian tradelong dashthat is, trade among east asian nations long dash has grown as a share of world trade. more than that, east asian countries do an increasing share of their trade with each other. using the gravity model, explain why east asian countries do an increasing share of their trade with each other.

The business cycle is the periodic but irregular up-and-down movement in economic activity, measured by fluctuations in real gross domestic product (gdp) and other macroeconomic variables. a business cycle is typically characterized by four phases—recession, recovery, growth, and decline—that repeat themselves over time. economists note, however, that complete business cycles vary in length. the duration of business cycles can be anywhere from about two to twelve years, with most cycles averaging six years in length. some business analysts use the business cycle model and terminology to study and explain fluctuations in business inventory and other individual elements of corporate operations. but the term "business cycle" is still primarily associated with larger (industry-wide, regional, national, or even international) business trends.

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