Demand curve is the relationship between price and quantity of product. In perfect competition, the demand curve for the product by a firm is perfectly elastic at maket price.
In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
The museum's revolving doors (A)/ stopped the crooks (B)/ as they jam half way round. (C)/ No error (D)