The future looks bleak for Staples as the leading U.S. office supplies retailer forecast its 15th straight quarter of declining sales. Staples is finding it difficult to compete with Walmart and Amazon. Staples said on Wednesday its total sales fell 3.7 percent to $4.75 billion in the second quarter ended July 30. Staples also reported a net loss of $766 million, or $1.18 per share, compared with a profit of $36 million, or 6 cents per share, a year earlier.
