Smiley has a new favorite game on my tablet.
I was looking for the old Apple game Taipan for its basic, age-appropriate economic lessons, and found a slightly more complex game named Merchant. (More information is available here.)
Taipan focused on "buy low, sell high". Merchant does not teach that particular lesson, but does a great job with other lessons about buying, selling, and value-added costs.
It is much too repetitive for an adult to enjoy. But it is perfect for a seven-year-old.
He was initially turned off because you send heroes on quests but do not get to actively direct them or see them fight. But he soon because caught up in the item crafting and selling.