Ali decides to attend the one-hour review session for microeconomics instead of working at his job. His job pays him $10 per hour. Ali's opportunity cost of attending the review session is: a. the $10 he could have earned at his job.
b. the one-hour review session
c. equal to the benefit he gets from the review session.
d. the value of the session minus the $10 he could have earned at his job
e. nothing, because the review session does not cost anything.

How do patents and copyrights encourage innovation? they limit the number of inventions an individual may patent or copyright, so more people can invent things. they prevent inventors and other creative people from making huge profits, thus keeping prices low for consumers. they grant companies the right to copy the inventions and creative works of individuals at little or no cost. they give inventors and writers exclusive rights to make and sell their inventions and works, possibly making large profits?

Luis and rosa, citizens of costa rica, moved to the united states in year 1 where they both lived and worked. in year 3, they provided the total support for their four young children (all under the age of 10). two children lived with luis and rosa in the u.s., one child lived with his aunt in mexico, and one child lived with her grandmother in costa rica. none of the children earned any income. all of the children were citizens of costa rica. the child in mexico was a resident of mexico, and the child in costa rica was a resident of costa rica. how many total exemptions (personal exemptions plus exemptions for dependents) may luis and rosa claim on their year 3 joint income tax return? a. 6 b. 5 c. 4 d. 2

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