A line graph showing how marginal cost, demand, and marginal revenue relate to one another."??? A line graph showing marginal cost, demand, and marginal revenue.??? The x-axis is labeled Quantity (units per hour).??? The y-axis is labeled Price or Cost (per unit)??? The marginal cost line shows an increase in price or cost as units per hour increases. At 1 unit per hour, marginal cost is $1 per unit. At 3 units per hour, marginal cost is $5 per unit. At 5 units per hour, marginal cost is $9 per unit.??? The marginal cost line shows a decline in price as units per hour increases. At 1 unit per hour, marginal revenue is $9 per hour. At 3 units per hour, marginal revenue is $5 per unit. At 5 units per hour, marginal revenue is $1 per unit.??? The demand line shows a decline in price as units per hour increases. At 1 unit per hour, demand is $9 per unit. At 3 units per hour, demand is $7 per unit. At 5 units per hour, demand is $5 per unit.??? The marginal cost line intersects the marginal revenue line at 3 units per hour and a cost of $5