Q $1$

In the figure below how many pounds of sugar are sellers willing to sell at a price of $$20?$ How much is demanded at this price? What is the buyer's willingness to pay when the quantity is $20$ lb $?$ Is this combination of $$20$ per pound and a quantity of $20$ lb an equilibrium? If not, identify the unexploited gains from trade.

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Q$2$

The market for sugar is diagramed below: