Economic analysis assumes "rational or purposeful behavior," which means that people will pursue decisions or actions

I believe the answer is: that will increase their well-being.

during the process, people would weight in the magnitude of benefit that they would obtain from doing a certain action compared to the expense and opportunities they need to sacrifice to obtain it. If the benefit is larger than the sacrifice, then people would see their action to be rational or purposeful

yes

it is because 3 because the citizen the northern democratic party watned the warning on red to blue because it is purple. lol