Key TakeawaysMcDonald's new "$5 Meal Deal" kicks off Tuesday as a number of fast-food giants have lowered prices or announced limited-time promotions in recent weeks.Fast-food rivals Wendy's and Burger King have also recently announced plans to lower prices or introduce temporary value deals.Companies across fast food and other industries have noted in recent months that consumers have decreased discretionary spending and focused on essentials as inflation has continued. McDonald's (MCD) has officially laun ...