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A sonic boom is the sound produced when an object breaks the sound barrier i.e when it travels faster than the speed of sound. When a body travels below the speed of sound (subsonic), the sound emitted by it travels in all directions.
It is sometimes held, that innovations cause the ups and downs of the business cycle. The most prominent defender of that view was probably Joseph Schumpeter. He stated that booms are due to technological or other innovations whose implementations at first seem to promise high profits.