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This video goes over the classic equation in economics MB=MC. The video explains what it means, and how we can get to it with three different examples.
Basically we care about efficiency. If marginal benefit is not equal to marginal cost then something is going wrong in the problem. Either our budget ran short or the firm is over/under producing. By looking at the context of the problem we can figure out what is going wrong and why marginal benefit is not equal to marginal cost within this context. It is also possible that market failures are occurring which is covered in another video.
More information on this topic can be found at www.freeeconhelp.com/2011/10/w...