Opportunity cost is
a. only experienced when you don't have enough money.
b. everything that you give up when you make a choice.
c. nonexistent because, eventually, we can have everything we want.
d. the value of the next-best alternative when a decision is made.

d) all choices are correct

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.