Refer to the figure below to answer the following questions. 
Figure 7.2.1
The figure shows the market for shirts in Canada,where D is the domestic demand curve and S is the domestic supply curve.The world price is $20 per shirt.
-In Figure 7.2.1,if the economy moves from no trade to international trade,producer surplus in Canada ________ by ________.
Definitions:
Relapse
The return of symptoms of a disease or condition after a period of improvement.
Frequent Vomiting
Recurring episodes of forcefully ejecting stomach contents through the mouth, which can be indicative of various medical conditions or reactions.
Anorexia
A potentially life-threatening eating disorder characterized by an abnormally low body weight, a fear of gaining weight, and a distorted perception of body weight or shape.
Teenager
An individual in the age group of 13 to 19 years, typically characterized by rapid physical, emotional, and intellectual development.
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