Why is a big bed room more expensive than a twin bed room?

Demand and supply, facilities and services.

1. Demand and supply: It is generally believed that the comfort and demand of single rooms (big bed rooms) are relatively high, which leads to the hotel setting a higher price for single rooms to meet this market demand.

2. Facilities and services: Single rooms (big beds) have more facilities and services than double rooms (standard rooms). For example, a single room will provide more furniture, advanced bedding, bigger TV, etc. These extra facilities and services require higher costs, so hotels will make up for these costs by raising prices.