It is true that a perfectly competitive industry faces a horizontal straight line demand curve whereas a monopoly faces a downward sloping demand curve.
A perfect competitive market has a straight line graph on the demand of goods and services this means that the goods are sold at the market price. Monopoly market price are not regulated hence the curve is not straight.
Therefore, It is true that a perfectly competitive industry faces a horizontal straight line demand curve whereas a monopoly faces a downward sloping demand curve.
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