It is ALL about "margin" baby ! A lot can be achieved at the MARGIN :)

"Marginal" :))) terms you should know:

• Margin --->  the last (in terms of quantity, not of time) unit consumed or produced by a consumer or firm.
• Marginal Cost
• Marginal Cost pricing
• Marginal Profit
• marginal Trade
• Marginal Benefit / Revenue
• Marginal Analysis ---> stresses how people optimize
• Marginal Change
• Marginal Product
• Marginalism
• Marginal Advantage
• Law of Equal Marginal Advantage ---> requires equivalent goods or similar resources to be allocated in equally advantageous ways at the margin. Failure to conform to this principle is inefficient.
• Marginal Adjustments
• Marginal of Preference
• Marginal Propensity (to consume, import, save etc)
• Marginal Rate (of substitution, transformation, of returns etc)
• Marginal Strategy ---> A term that I just coined (or atleast I think, I did)
• Marginal tax
• Marginal Utility
• Marginal Value Product ---> MVP (not to be confused with Minimum Viable Product)
• Dumping margin
• Injury margin

Useful link for Economics definitions:
http://www-personal.umich.edu/~alandear/glossary/m.html