Answer:Yes, the Manager made an error.
Step-by-step explanation:
Increasing the revenue of a firm depends on two factors which are price and effective demand. An increase in price without a fall in demand will increase revenue, an increase in demand without a fall in price will equally increase revenue.
However when manipulating price only in order to increase revenue care must be taken to ensure same or higher level of demand for an increase in price which lead to a fall in demand may boomerang for the firm.
E.g
Year. $ Price. Demand. Revenue$
1. 5. 100. 500
2. 6. 80. 480
The above illustrate an increase in price without a rise or maintaining the same level of demand leads fall in revenue.