Apple could experience a decline in the use of their services as the Justice Department case against Google's anticompetitive practices starts.

The case is looking at the deal between Google and Apple to set Google as the default search engine on Apple goods.

Toni Sacconaghi, an analyst for Bernstein reckons that Apple’s share prices could fall as much as 20% if the case determines that Google can no longer be a default setting on Apple devices. 

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