In the short run a pure monopolist will maximize profits by producing at that level of output where the difference between price and average total cost is at a maximum.

Average Total Cost

The total cost of production divided by the quantity produced, representing the per-unit cost of production.

Pure Monopolist

A single supplier in a market, with no close substitutes for its product, giving it significant control over prices.

Maximum Profit

The highest level of profit attainable when total revenue is maximized and total costs are minimized under given market conditions.