Starbucks is considering investing $40 million to increase customer satisfaction. The document discusses Starbucks' service quality model and focuses on reliability, responsiveness, assurance, empathy and tangibles. It recommends that Starbucks invest the $40 million as it could shift an average of 7,808 customers per day to a highly satisfied category, generating over $100,000 in additional daily revenue. An alternative is to invest in product innovation or target new customer groups instead of customer satisfaction.