ABC News' Elizabeth Schulze reports on McDonald's slowing sales as the fast-food giant says its efforts to attract cost-conscious consumers have failed to meet expectations.McDonald's called it a "challenging consumer environment."CEO Chris Kempczinski said on a recent earnings call that its US business “slowed significantly” during the second quarter and that results were “below our expectations.” A recent AP-NORC poll showed more than half of Americans have cut down in eating out in order to pay for other necessities. Shocking. Earlier this year, it phased out many digital promotions and its “Buy One, Get One for $1” deal in favor of a new McValue menu that sold many items under $3. But the deal was seeing “inconsistent execution” at franchises with only about 65% of restaurants using the “recommended pricing architecture.” “In combination, all of these factors negatively impacted visits from some our most loyal customers,” said McDonald’s Chief Financial Officer Ian Borden.Borden said McDonald’s will roll out new promotions next week in its app to “re-energize our high frequency customers.”Sources: 1 | 2 | 3