Use the figure given below to answer the question. The figure at below shows a country's domestic supply $($S$)$ and demand curves $($D$)$ for a good, as well as the world price of the good, Pw$,$ that a small country faces on the world market. Initially, however, the country is not trading freely, but is instead imposing a tariff on imports of this good that causes the domestic price to be Pd $,$ as shown.

Q represents quantity and several areas are labeled $a,b,c,d.$dots.

The price and quantity produced before free trade $($autarky$)$ are $q,$ and

$$ respectively.