Final answer:
Kimberly's increased budget for concerts and getaways due to a rise in income shifts her budget constraint rightward, allowing her to choose a combination of both that provides higher utility, focusing on equating marginal utility per dollar spent.
Step-by-step explanation:
When Kimberly's income rises to $2,000 per year for concert tickets and overnight getaways, her budget constraint shifts to the right.
This increase in income allows her to reassess the utility and marginal utility she receives from both activities. With a higher budget, Kimberly can now choose a combination of concert tickets and overnight getaways that provides her with a higher level of utility than before.
If the marginal utilities per dollar are unchanged, her new choice will likely involve purchasing more of both goods, up to the point where her marginal utility per dollar spent is equalized for both goods.
However, if her preferences or the marginal utilities change, she may choose a different combination that maximizes her utility with the new budget constraint.