Final answer:
Good weather conditions increased the supply of California commercial salmon, resulting in a higher equilibrium quantity sold at lower prices, with this change disseminated through newspapers and the Internet.
Step-by-step explanation:
The innovation that changed the American salmon market relates to the good weather conditions that led to an increased supply of California commercial salmon.
This increase in supply resulted in a higher equilibrium quantity of salmon being bought and sold in the market, which in turn led to a lower price for consumers.
Such a change was widely reported through newspapers and the Internet, suggesting the power of mass media in dispersing information regarding fluctuations in market dynamics.