NEW YORK, June 22 : Amazon Prime Day starting on Tuesday will be a litmus test of U.S. shoppers' spending power, with the earlier-than-usual sales event increasingly centered on perishable groceries, household basics and back-to-school needs rather than carefree splurges.The four-day blitz running June 23 to

Prime Day is expected to draw more shoppers this year, with consumers hunting for deeper discounts as they stock up on essentials.

NEW YORK, June 22 : Amazon Prime Day starting on Tuesday will be a litmus test of U.S. shoppers' spending power, with the earlier-than-usual sales event increasingly centered on…