Answer:
B. It is a common form of economic thinking
Explanation:
Thinking at the margin is a pattern of thinking where the thinker thinks forward with regard to the coming hour, the coming day, or coming income, while letting the past to go and considering what is presently best for the the thinker or in the coming times.
Thinking at the margin involves thinking ahead, and in economics principle, thinking at the margin is required for making rational decisions
An example of thinking at the margin is deciding to by more pasta for the month than required when there is a scarcity of a brand of pasta and the inflation, which may both be due to the introduction of better brand of pasta by the manufacturer causing a delay, and a temporary inflation respectively
Therefore, thinking at the margin is a common form of economic thinking
