Why is marginal change so Important in making economic decisions?

Marginal costs and benefits are a vital part of economics because they help to provide the relevant measurement of costs and benefits at a certain level of production and consumption. If measured marginal costs and benefits are provided, it is much easier to calculate the ideal price and quantity.

- "the four new england colonies of colonial america included colonies of new hampshire, massachusetts bay colony, rhode island and connecticut."

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answer placeholder because the system is messed up