The reason why people are charged for an additional can of soda they get from a soda machine, but are not charged for an additional paper taken from a newspaper dispensing machine, is that the marginal utility of an additional:

The correct answer is Soda diminishes slowly, but the marginal utility of an additional paper is close to zero.

Explanation:

Marginal utility is the benefit we get from the consumption of an additional unit of a good or service.

Marginal utility (UM) refers to the concept of “additional” or “extra”. Thus, it is the utility that is added or added when we consume a unit more than one good or service.

vMarginal utility depends on consumer preferences, which are not always known. However, regardless of its form or level, economists often agree that it is generally true that, as the consumption of a product increases, the profit we obtain is falling. This phenomenon was reflected in the so-called "law of diminishing marginal utility".

answer; ///(c) i believe its it ignores cash flows following the payback period;

if you use only 25 for your entertainment and only 200 for the groceries that you really need and take out the 50 per month for the computer then that should be enough