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Gross Domestic Product (GDP) is the monetary value of all final goods and services produced within a country's borders in a specific time period. It is usually divided into four major components: consumption (C), investment (I), government spending (G), and net exports (X-M). Where X stands for exports and M stands for imports of goods and services.

In the short run, GDP varies due to fluctuations in one or more of its components. For example, an increase in consumption due to improved consumer confidence, higher investment as businesses expand, or a rise in government spending can all cause GDP to grow. Conversely, a decline in any of these components can lead to lower GDP. These fluctuations are often referred to as the business cycle, which includes periods of economic expansion, followed by periods of recession. Another factor affecting short-run GDP is changing net exports, influenced by factors such as exchange rates and global economic conditions.

In the long run, GDP growth is driven primarily by increases in productivity, population growth, and technological progress. These factors help determine the economy's potential GDP, which is the level of output that can be produced when all resources are fully employed. In a high-income economy like the United States, long-run GDP growth has been relatively stable, averaging around 2-3% per year over the past few decades. This means that, despite short-term fluctuations, the economy has generally been able to maintain a steady growth rate.

Government policies can have significant effects on both short- and long-run GDP patterns. For example, during times of economic downturn, governments can employ expansionary fiscal policies (such as increasing government spending or cutting taxes) to stimulate growth and counteract the downturn. In the long run, policies that promote investment in infrastructure, education, and research can contribute to increased productivity and support long-term economic growth. In summary, the typical GDP patterns for a high-income economy like the United States in the short run involve fluctuations in the components of GDP, influenced by factors such as consumer confidence, investment, and government spending. In the long run, GDP growth is driven by factors such as productivity, population growth, and technological progress, with government policies playing a role in shaping both short- and long-run GDP patterns.