I was reading this answer on this website which talked about how MB = P at allocative efficiency. "Why does allocative efficiency occur when P=MC rather than MB=MC"
In this answer, it is stated that the last (i.e. marginal) consumer who buys will be the one for whom the benefit is just equal to the cost.
I'm a bit confused about the use of the world marginal. I read online that it means "one more", but isn't that different from the use of the word marginal above? And how is MB = P, isn't marginal benefit referring to many points along the curve?