Three years ago, I adopted a Cocker Spaniel, and since then, walking has become my favorite activity. This has been great exercise and a great way to meet the neighbors. But, during my walks, I have come across few other Cocker Spaniels and, therefore, was surprised to learn that for decades, the Cocker Spaniel was the most popular breed in the United States. This got me thinking about the implications of changes in breed preferences on the demand for veterinary services. In economics, when a widespread change like this occurs over time, we refer to the phenomenon as a change
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