Marginal Costs. The marginal cost of production is the change in the total cost associated with making just one product or item, and is determined by dividing the change in cost by the change in quantity. Generally, marginal costs start high and decline as production increases.
Muchacho is a Spanish word for boy or young man. An example of muchacho is a teenage boy living in Mexico City.
A farrago is a pile of odds and ends or a random assortment of stuff. If your teacher said your paper was a farrago of thoughts, that's not good: a farrago is a disorganized mix of things that don't fit together. Farrago sounds more formal than hodgepodge or mishmash, but it means about the same thing. A flea market usually features a farrago of antiques and old junk.