Answer: Only when demand is inelastic
Step-by-step explanation:
For a product that has an inelastic demand, the demand of a buyer with regards to a product has minimal changes when when there is a change in price. In such case, an increase in the price will lead to an increase in revenue.
On the other hand, for a product that has an elastic demand, there will be a greater change in the demand of the buyer when when there is a change in price. In such case, an inrease in the price will lead to an reduction in revenue as buyers will go for other products.
Therefore, the admission price should be increased when demand is inelastic in order to increase revenue.