The first product license has an average margin price of $3 based on all products in that license. Based on that, any license that is greater than $3 is considered a better product license. Other factors like shelf space and storage space a product occupies has a major impact. For example, toilet paper takes up only two spots on a shelf and takes up one spot on a storage rack. Not worth it in my opinion. Books are an example of a better option because they take up a standard amount of space on a shelf, 8, but can stack up to 6 full boxes on a rack.

Customers have a limit to the total amount of product they can purchase which is why you want to have high margin products on the shelves. The total amount of customers that show up at the store is based on store level, not product licenses unlocked. Below is my recommended product license strategy as you play through the game.

1st Product License #9 - Margin Price $4.70 - Store Level 16 and $1,950

• Moussaka (Ronpoint)
  
• Salmon (NordicHarbor)
  
• Scallop Gratin (Prypiat)
  
• Steak (Bovora)
  
• Sushi Large (Ulego)
  
• Sushi Small (Ulego)
  
• Veal Chop (Bovora)

2nd Product License #17 - Margin Price $4.25 - Store Level 56 and $12,500

• Beer Blonde Ale (BK)
  
• Beer Lager - 6 Pack (Teochew)
  
• Beer Lager - Keg (Teochew)
  
• Vodka (Magnat)
  
• Whiskey (Grand Marnier)
  
• Wine (Chebon)

2nd Product License #20 - Margin Price $5.92 - Store Level 70 and $22,000

• Book (Abc)
  
• Book (Colors)
  
• Book (Donnine)
  
• Book (Electromagnetic Field)
  
• Book (I Won't Share)
  
• Book (Mother and Child)

3rd Product License #19 - Margin Price $5.63 - Store Level 70 and $22,000

• Cleaner (Wesh)
  
• Dishwasher Tablet (Cemagik)
  
• Dish Soap Lemon (Mouss)
  
• Fabric Softener (Souplesse)

4th Product License #24 - Margin Price $7 - Store Level 81 and $34,600

• Book (Krok)
  
• Book (Once Upon A Time)
  
• Book (Piticha)
  
• Book (The Surprise)
  
• Book (Vintage Storybook)
  
• Book (Wombat)

5th Product License #26 - Margin Price $5.5 - Store Level 90 and $65,000

• Beer Blonde Ale - 6 Pack (BK)
  
• Beer Blonde Ale - Keg (Degl)
  
• Whiskey (Jack Sublett)
  
• Whiskey (Japanese)
  
• Wine (Heng)
  
• Wine (Pouilleux)

Thanks for reading and hope this is helpful.

The layout of my market is shown below. Stocking shelves fully vertical provides two benefits. It helps identify when you are out of product and gives leeway on ordering more.

1 Tall Rack can hold 20 or more boxes of products depending on the product type.
Based on that, you can usually order 20 of one product to fill 1 Tall Rack.
In the screenshot below, 2 boxes fill one spot on the rack. Since there are 10 spots on the rack, that means it can hold 20 boxes.
When ordering, always max out the product to 10 and buy twice. That will fill a rack.
You'll know when to order more when your market shelves aren't fully stocked.

I see a lot of people are struggling with the stockers getting stuck. The bug only affects people who had saved games before the patch with storage racks that had products on them. Here is the solution to solving the issue.

First step is to clear all the racks you had before the patch. Or just clear all your racks in general.

Second step is to remove all the tags.

Final step (Optional) Save and return to menu then go back in.

This should reset the storage racks and should resolve the issue. I haven't had an issue since doing so.