Demonstrate Diminishing Marginal Utility please don't use answer already out there

Diminishing marginal utility holds that the additional utility decreases with each unit added. It is another example of the more general law of diminishing returns that we've seen in an earlier chapter, Choice in a World of Scarcity.

1. Pick a good or service and explain how or why one would experience diminishing marginal utility for this good. It may also help to explain over what time horizon you would experience this diminishing marginal utility.