Starbucks' president reveals why the chain rolled out its controversial new rewards program (SBUX)

Starbucks faced backlash when it launched its new rewards program earlier in April, with some of its most loyal customers complaining about changes. 
Roz Brewer, the president of Starbucks' US business, said that that the changes aim to make the rewards program more accessible, as Starbucks tries to win over less frequent customers. 
Brewer also said that the volume of calls Starbucks has received regarding the changes is lower than the company expected. 
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