Which of the following titles would best complete this chart?

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Responses

Causes of a Boom-and-Bust Cycle
Causes of a Boom-and-Bust Cycle

Developments in the Aeronautics and Aerospace Industries
Developments in the Aeronautics and Aerospace Industries

Effects of the Discovery of Oil at Spindletop
Effects of the Discovery of Oil at Spindletop

Principles of a Free Enterprise System

Principles of a Free Enterprise System