Which type of document usually describes the basic structure, functions, and powers of a government?

The constitution

Explanation:

Constitution is commonly known as the ultimate or supreme law of used in governing a particular land (Country).

The constitution ensure that there is Separation of Powers between the different branches of government to make sure that non enroach on the power of the other and importantly that no one person, branch or group becomes too powerful. It also has the Checks and Balances as it is the principle that state that the three branches of government which are legislative, Executive, and Judicial arms or branch of government should have some power each other that is the ability to check or limit the power of the other branches of government.

in this scenario it would be the consumer demand as most influential in making the decision. the band members need to figure out where and from whom they will make the most money, in other words who out of the two consumer groups - football fans or car drivers - will spend their money, who is more likely to contribute to their cause and buy what they are offering.