Apple Inc. sells AirPods and enjoys monopoly power because no close substitutes are available to consumers. Apple Inc. can set a price well above the competitive supply and demand level by...

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using technology to speed production.

advertising to expand the market.

restricting output.

pushing the supply curve as far to the right as it will go.

If the average cost of producing 11 units of output is higher than the average cost of producing 10 units of output then (MC stands for Marginal Cost and AC stands for Average Cost):

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MC(10) = AC(10).

MC(10) < AC(10).

MC(10) = MC(11).

MC(10) > AC(10).