Which part of the marketing mix for retailers refers to the variety and depth of products?

the product part of the marketing mix refers to the variety and depth of products.

The correct answer is:  product assortment.

Explanation:

The product assortment is the types of products manufactured by a company or offered for sale by a retailer. The assortment includes the breadth (variety of goods), length (number of each type of good), depth (different version of the same variety of goods), and consistency (relation between one variety of goods and another).

it's actually a very difficult task, due to not many people can make 2 million dollars in 2 years. besides that, to the not-so-realistic ideas, you can create a business. it could be practically anything, but make it into a business that isn't that known yet, you get me? also, lets not forget about stock market. that's where all the good stuff happens. use investments at the beginning and begin to raise up your business or whatever you're going to do. as this is a very non-realistic idea, it's still worth the shot!