Animal Crossing: New Leaf- How to unlock the shop
There will be few shops open, when you move into your village and you will be able to upgrade and add new shops.
You will be able to upgrade the item shop so you can sell more items. To do this you will need to spend bells at the item shop along with few other things. The items that can be sold out count toward your total. This like stationery, melody cards and wrapping paper don't count toward the bell total.
Convenience Store upgrade
You need to have a house not a tent to upgrade the convenience. If you have a tent you need to upgrade to a house by giving Tom Nook 10,000 bells. Once you have spent 12,000 bells in the shop, or bought at least 15 items. Also you need to allow 10 days after creating the town.
To be able to upgrade the Supermarket you need to spend 25,000 bells in the shop. In addition it must be at least 10 days since convenience store opened and at least 10 days since the garden center opened.
Home Center upgrade
To be able to upgrade you need to spend 50,000 bells and must be at lease 21 days since building the supermarket.
Department Store upgrade
To be able to upgrade you need to spend 100,000 bells in the shop and must be at least 30 days since you built the home center. In addition you need to pass Gracie's fashion check at least four times.
Work in progress