The demand curve D₁ for tomatoes at Pike Place Market shows how the quantity of tomatoes demanded varies with the price. As the price of tomatoes decreases, consumers demand greater quantities of tomatoes, creating a downward-sloping demand curve. At a price of $5 per pound, consumers demand no tomatoes; at $4, $3, $2, and $1, consumers are willing to purchase 200, 400, 600, and 800 pounds of tomatoes, respectively.