Shoppers encounter empty shelves as they shop Thursday, July 24, 2014 at the Market Basket supermarket in Haverhill, Mass. A decades-long family feud, which brought about the ouster of Arthur T. Demoulas as CEO of the privately held company, led to a worker revolt, customer boycotts and empty shelves in the grocery chain's stores in Maine, Massachusetts and New Hampshire. More than 100 Massachusetts legislators and mayors, Massachusetts Attorney General Martha Coakley, and New Hampshire Gov. Maggie Hassan have publicly supported the employees. (AP Photo)
Employee and customer action has put a big dent in Market Basket’s business.
AP Photo

A source with knowledge of Market Basket’s business operations tells Boston.com business was down close to 70 percent by the middle of this past week.

Previous reports have said business is down more than 90 percent at some individual stores.

A boycott and thinning inventories have been at the center of a protest movement staged by employees and customers to reinstate former CEO Arthur T. Demoulas.

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While warehouse workers walked off the job and stores began refusing deliveries last weekend, employees did not begin encouraging a customer boycott until Monday.

Many customers now appear to be heeding that demand.

With Saturday and Sunday being popular days for grocery shopping, the continued protest efforts are likely to result in an even steeper drop in store sales.

Check out more Boston.com coverage of the Market Basket saga here.