The following is a passage from this article:
Slate quickly dubbed the new venture an enterprise to “replace waiters,” and Time declared, “You’ll never have to interact with another human being again.” But at least for now, the company insists the move won’t affect its staffing. And if the tablets take off, they could conceivably help staff earn more tips – by enabling patrons to pay more quickly and efficiently (a swipe of the credit card at the patron’s convenience, rather than the bringing of a bill, ringing it up, and bringing back the change) — a move that spells higher turnover.
I assume turnover as referred to at the end of the paragraph means the rate at which goods are sold in a shop/store instead of the rate at which employees leave a company and are replaced by others. If my assumption is correct, then wouldn't the use of spell in a move that spells higher turnover be inaccurate? because according to OALD, spell is defined as:
to have something, usually something bad, as a result; to mean something, usually something bad
But if turnover here refers to goods instead of employees, then higher turnover from the launch of these tablets would be a good thing isn't it? and not something bad as stated in the dictionary.