Answer:
c. "Currency Exchange"
Explanation:
According to my research on Economics, I can say that based on the information provided within the question the term being described in the question is called "Currency Exchange". When exchanging currency for example, Argentinian Peso (ARS) with United States Dollar (USD), There are two values a sales price and a buying price.
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<span>Ivan pavlov's experiments on the timing of associations demonstrated that two things become associated because one idea changes the value of another idea. They have common features,also occurring at the same time.</span>
