Final answer:
This scenario is an example of the market economy. John's actions of taking the video games, setting up a table, and selling them to students for money demonstrate the operation of a market economy.
Step-by-step explanation:
This scenario is an example of the market economy. In a market economy, individuals and businesses have private ownership of resources and make their own economic decisions based on supply and demand. John's actions of taking the video games, setting up a table, and selling them to students for money demonstrate the operation of a market economy.