WHAT DOES PRODUCT DO (what can you do with it?)?

Productis a medium currency you spend to purchase Business and Character Upgrades.

Character Upgrade

If you want to upgrade a Character, you can do it from the Characters List by tapping on the Character List button, the second button from the left,  at the bottom of the gameplay screen.

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Business Upgrade

Tap the Business List button on the lower left corner of the screen to see a list of all Businesses you have unlocked. From this screen, you can use Product to upgrade Businesses.

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You also can use Product to buy cards in The Store. 

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