discussions in micro and macro economics

Please write 3 brief discussions about the following:

1- All economies operate with scarce resources which lead to opportunity costs. The current administration of the United States is promoting increased border security at the Country’s southern border.

Explain, as an economist versed in opportunity costs, how how you could either support or contradict the use of scarce resources to increase security at the southern border.

2- Why is the quality of fresh produce (for example fruits and vegetables) poor in the winter when prices are high and good in the fall when prices are low?

3- Many Universities, including Montana Tech, have more one-year scholarships available for incoming Freshmen students as opposed to existing junior and senior students already on campus. Use your understanding of elasticity to explain why more scholarships are available for incoming freshmen students.