The fight is on for lower-wage workers. Some of the biggest U.S. employers of entry-level workers are adding tens of thousands of new positions as the economy roars back from the coronavirus pandemic. Many are raising wages or adding perks to entice workers away from other jobs or off the sidelines of the labor market. Amazon.com Inc. said Thursday that it would hire 75,000 more workers and offer $1,000 signing bonuses in some locations, its latest hiring spree in a year of tremendous job growth at the e-commerce giant. McDonald's Corp. said that it wants to hire 10,000 employees at company-owned restaurants in the next three months and that it would raise pay at those locations. Chipotle Mexican Grill Inc., Applebee's and KFC are among other chains seeking to hire tens of thousands of workers as they reopen dining rooms and seek to bolster staffing there.