How did a little boy want to become a millionaire

One sunny afternoon, Alisa, Mark, and Dominic sat under the big oak tree in their favorite park, talking about what they wanted to be when they grew up. Mark, with a sparkle in his eyes, declared, 'I want to become a millionaire!' His friends giggled, but they could see he was serious. 'But how?' Alisa asked, intrigued by Mark's big dream.