Let N be the number of applicants to a university, p the charge for food and housing

Question:

Let N be the number of applicants to a university, p the charge for food and housing at the university, and t the tuition. Suppose that N is a function of p and t such that ∂N/∂p < 0 and ∂N/∂t < 0. What information is gained
by noticing that both partials are negative?

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