This scenario describes a situation where firms' profitability is affected by a decrease in the price level, leading them to cut back on production due to fixed nominal wage contracts. This is best explained by the a. sticky-wage theory of the short-run aggregate-supply curve.
The sticky-wage theory suggests that nominal wages are slow to adjust to changes in the price level, and as a result, when prices fall, the real wages increase, reducing firms' profits and their incentive to hire or produce at previous levels.