"13" It all Marginal cost these days

1. Why do marginal costs first fall and then begin to rise? I suspect marginal cost comes into alignment as production becomes efficient. The kinks are worked out, things are running smoothly. When the decision is made to increase production those cost will rise agin as that increases raises marginal cost.
2. Why are marginal costs important to a firm when making decisions to increase or decrease production? Marginal cost is the cost of of adding additional production of a single unit. The question to the firm would be if the additional cost means additional revenue? If so it may be time to increase production if not it may be time to maintain of even decrease production all together in an effort to reduce or not incur additional cost.
3. How can you apply these cost concepts to your own life? How do they relate to opportunity costs? I was talking with my wife about this the other day. Typically our family travels a lot during the summer. Visiting family back East friends to the north of us or to the south of us or just finding adventures. This summer with two kids driving to and from work and whatever else they do filling up the tank one more time to go to Montana just does not make a lot of sense. There are a number of additional reasons COVID, people seem to be everywhere. We live in a wonderful place with so much to do why go so far afield in search of adventure. Get up get going and get back before the craziness begins. We don't spend extra money, we don't give up a lot because there is a lot to do here and if we get up and get going we found it more enjoyable. We may give up a little sleep but we are spending a lot of less time in the car.