Do reporters understand that demand curves slope downward?

This statement in the NY Times caught my eye:

"While New York City has always had a vacancy rate lower than most other cities, rental prices jumped last year by a record 8.3 percent."


So more people wanting apartments then are available is associated with a jump in rental prices? What is the word "while" doing in the sentence?

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Do reporters understand that demand curves slope downward?
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Oleh