Marcie's friend and I disagree. It's a sunk cost because I already paid $80 for the book. Reading macroeconomics now will not benefit me because I am supposed to be reading microeconomics now.
What is macroeconomics?
Macroeconomics is the study of how an entire economy—markets, businesses, consumers, and governments—behaves. Macroeconomics studies economic phenomena such as inflation, price levels, economic growth rate, national income, GDP, and changes in unemployment.
Macroeconomics addresses several key questions, including: What causes unemployment? What factors contribute to inflation? What causes or promotes economic growth? Macroeconomics seeks to quantify an economy's performance, understand what forces drive it, and forecast how performance can improve.
As a result, I disagree with Marcie's friend that sunk costs should never be considered when making a financial decision.
To learn more about macroeconomics
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