From an economic perspective, when consumers leave a fast-food restaurant because the lines to be served are too long, they have concluded that the

the marginal cost of waiting is greater than the marginal benefit

Explanation:

Marginal cost is the additional cost as a result of carrying out a particular activity.

Marginal benefit is the additional benefits that accrue to an individual for carrying out an activity

It is assumed that human beings are rational, utility maximisers. They would not continue to carry out an activity if the marginal cost is greater than the benefit

answer; 20% is your answer;

the correct answer would be b, when, queen, calder hall and london.

explanation:

we always capitalize words when a paragraph or sentence is starting, when an important name is used, when a place is being written, or simply when a noun is used, etc. so in this sentence, sentence is starting from 'when', so it will be written in capital letters. secondly, queen is considered to be an important person, so it will also be written in capital letter. next, the name of the town is mentioned, i-e calder hall, which will also be written in capital letters. in the last,   city name is being used, 'london', which will also be written in capital letters. so option b is the most appropriate one.