Which is not one of the four important elements a market needs for success? a. mass production b. self-interest c. specialization d. economic freedom

Self interest is probably the answer.

I believe the answer is B. Self interest

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's.