When prices of basic necessities surged two years ago, more higher-income shoppers turned to Walmart Inc. to ease the strain on their bank accounts. Now, as those price increases start to cool, one analyst believes the big-box discount retailer WMT, +1.24% can hold onto those customers, as the chain, known for its lower prices, gains a bigger reputation for offering convenience. “A key question is if [Walmart] can maintain those customers in a less inflationary environment,” D.A. Davidson analyst Michael Ba ...