The motor carrier industry is known to contain a high percentage of variable costs and a relatively lower percentage of fixed costs. Why is this case? In your initial discussion board post, make an argument for 2 - 3 variable costs that motor carriers are forced to pay that are the most impactful on their profitability. Support your argument with examples of how motor carrier costs have fluctuated over the years. Attach your completed LP4 Practice Activity Worksheet to your initial post to receive full credit for this discussion board activity. Discussion Rubric