I believe they go up because for supplies to be limited, people must be buying that product. So it makes sense once the products are limited, the prices will go up because either way the people are buying. Maybe even more now, more abundantly and faster because the product is limited.
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The United States Constitution has granted both the president and Congress power over the development of foreign policy. Presidential power to implement foreign policy is fairly broad. Presidential powers include the power to negotiate treaties and appoint ambassadors
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