How does cost differ from opportunity cost

Why are people more likely to marry individuals with social and cultural backgrounds very similar to their own? a. parents and other family members always exert pressure to marry within the group. b. people spend a great deal of time alone, and therefore can have few opportunities for meeting people. c. people develop irrational fears of out-group members and are scared to date them. d. people have greater access to individuals like themselves.

Imagine you are driving down the highway and reading a sign that states save the planet don't litter which technique of policy enactment is being used

What does the point on the graph represent? a. aggregate supply and demand equilibrium b. aggregate supply c. aggregate rising prices and supply d. aggregate rise in gdp