In Zoo Shops you can sell up to 8 items from your town using baskets which rewards coins, experience and popularity points. The items you can sell are shown in a row below similar to factories. You can also see how many of the goods you have in the barn.
When you drag an item into a basket a counter will start (which shows the time it will take to sell the item). When the item is sold you can receive the coins/experience/points by swiping your finger over the basket(s). Selling an item at the Zoo rewards the same experience as that item produced from the factory, and the amount of coins as if you sold the item from the barn.
Zoo Shop Item List
The item list changes every 7 days, and you can see the time remaining when you touch and hold the small '?' in the top right corner after the products.
Sometimes there are hot items in the Zoo Shops. If you sell items that are hot before the time runs out you will get double the amount of coins, experience and popularity points. You can also use the laboratory booster Popular Passion to increase the amount of popularity points earned for selling items by 2x. It applies for both regular and hot items, so it's best to use on a day with many hot items that are worth a lot of points. Selling 15 minute hot items also adds up to a lot of points if you have time to constantly sell them.
From level 8+ you will be offered all upgrades until they are maxed out. If you choose not to increase baskets when they are offered (at level 8, 12 and 16), they will be offered again until you upgrade it and have the max number of baskets for that level.