the line that is parallel will be y = 1/2x
The top 4 firms have (23 +22 +18 +12)% = 75% of the market.
The 4-firm concentration ratio is 0.75 or 75%.
Answer:
C) 2/9
Step-by-step explanation:
1. you add up all of the marbles (18)
2. you find how much blue marbles are out of that sum of the total marbles (4/18)
3. simplify if possible (2/9)