Answer:
monopolistic competition is when an industry has many firms offering products that are similar but not identical. unlike a monopoly, these firms have little power to set curtail supply or raise prices to increase profit. Monopolies dictate over a specific thing so they are the only thing that is selling. 
Explanation:
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The GDP is $12 billion.
<h3>What is Velocity of circulation in Economics?</h3>
In Economics, Velocity of circulation refers to the circulation of the amount of the money during a given period of the time. The calculation of the velocity of circulation is done by dividing GDP by the country's total money supply.
The Gross domestic product (GDP) is the standard measurement of the total value of the goods and services produced in the country in the given period of time.
According to the question, Velocity of Circulation is 4 and quantity of money is $3 billion.The calculation of the GDP is as follows:-
Gross domestic product = 4×3 billions
                                      = $ 12 billions
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When the political conventions are held in close proximity then the voters get disengaged resulting in negative consequences. Thus, option A is the correct option. 
<h3>What are conventions?</h3>
The meeting in a particular region especially for the political campaigns to address the common interest of the audience is called the conventions. It is conducted to address the voters.
The two conventions when held close disengage the audience and result in confusion and loss. It does not increase the viewership, or voter turnout, though it has a little influence and effect it majorly is negative.
Therefore, option A. the conventions disengage the voters.
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