Package wars: Postal Service offers next-day Sunday delivery

WASHINGTON — As consumers demand ever-quicker and convenient package delivery, the U.S. Postal Service wants to boost its business this holiday season by offering what few e-commerce retailers can provide: cheap next-day service with packages delivered Sundays to your home.Retail giant Walmart says it is considering the Sunday option, which could reshape weekend shopping trips to the mall.The program, available in 20 major U.S. cities, allows consumers to place online orders with participa