In the pasta aisle of the grocery store, Maile Diaz surveyed her options. In the 6-year-old’s hands was a shopping list she wrote out before she and her father left home. “This one is $1,” Paolo Diaz said, pointing to a box of spaghetti on sale at 10 for $10. “This one is $2.99. Which one should we get?” “This one,” Maile said, selecting the less expensive of the two. It may not have made for the speediest shopping trip, but for the Diazes, grocery shopping is about more than restocking the pantry. It’s a weekly opportunity for Diaz to start teaching his daughter, in first grade, how to manage and spend money wisely.