The trough phase in the business cycle is a period when the level of business activity declines and gdp falls.
Trough
The trough is the fourth phase of the business cycle. The declining GDP begins to decrease its rate of negative change, eventually turning positive again. The economy begins a transition from the contraction phase to the expansion phase.
Therefore, the phase in the business cycle wherein the level of business activity declines and GDP falls is trough.
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