The "mozart effect" refers to the now-discounted finding that cognitive ability is boosted by

I believe the answer is: listening to classical music
According to various researches, listening to classical music could improve our ability to finish short-term mental performances.
The research believes that listening to the music would serves as a stimulus that make the nerve function in our brain to work faster.

Fiscal policy because it refers to the use of government spending and tax policies to influence macroeconomic conditions, including aggregate demand, employment, inflation, and economic growth.