When the law of diminishing marginal returns takes effect, the total cost curve begins to change A. To decline at an increasing rate; B. to rise at an increasing rate; C. To decline at a decreasing rate; D. to rise at a decreasing rate Hello, I'd like to ask why we don't choose B. I think that when the law of diminishing marginal return comes into effect, that is, the law of increasing marginal cost comes into effect. At this time, the cost increases gradually, so the total cost rises at an increasing rate,

When the law of diminishing marginal returns takes effect, the total cost curve begins to change A. To decline at an increasing rate; B. to rise at an increasing rate; C. To decline at a decreasing rate; D. to rise at a decreasing rate Hello, I'd like to ask why we don't choose B. I think that when the law of diminishing marginal return comes into effect, that is, the law of increasing marginal cost comes into effect. At this time, the cost increases gradually, so the total cost rises at an increasing rate,

When the law of diminishing marginal return takes effect, the total cost curve begins: (d rises at a decreasing rate) he indicates that the total cost still rises, but the amount of increase begins to decrease, similar to the section of parabola with upward opening in the mathematical image, I want to ask why we don't choose B - "when the law of diminishing marginal returns takes effect", which gives us the decreasing speed, not the increasing speed. If we regard the speed as a scalar, we can choose B. But here we see that vector is more suitable