The proposition that if private parties can bargain without cost over the allocation of resources, they can solve the problem of externalities on their own, is called: a. the pigovian theorem. b. a corrective tax. c. the externality theorem. d. the coase theorem.

It is called d. the Coase theorem

Explanation:

"If private parties ... over externalities on their own" is the common wording of the Coase theorem.

Besides the commonly mentioned requirement that transaction cost must be zero, there are other assumptions to be satisfied including:

1. Clearly defined property rights (to bargain on)

2. No wealth effects (because the money you receive/pay for the benefits/costs will make you poorer/richer and change how valuable they are to you)

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.