If a foreign monopoly seller's marginal revenue curve is twice as steep as their demand curve, a tariff imposed on them will increase domestic prices by half of what it costs and decrease their net prices by half of what it costs.
The same variables that drive the demand curve also affect the marginal revenue curve: changes in income, changes in the costs of alternatives and complements, changes in population, etc. The MR curve may spin and shift as a result of these causes. Under perfect and imperfect competition, the marginal revenue curve is different (monopoly).
A demand curve in economics is a graph that shows the relationship between the cost of a certain good (the y-axis) and the amount of that good that is desired at that cost (the x-axis). Demand curves can be used to both the price-quantity connection for a single consumer (a single demand curve) and for all consumers in a given market (a market demand curve).
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